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• Conference contribution

  Towards domain-specific flow-based languages

  Zarrin, B., Baumeister, H. & Sarjoughian, H., 2018, MODELSWARD 2018 - Proceedings of the 6th International Conference on Model-Driven Engineering and Software Development. Hammoudi, S., Pires, L. F. & Selic, B. (eds.). SciTePress, p. 319-325 7 p. (MODELSWARD 2018 - Proceedings of the 6th International Conference on Model-Driven Engineering and Software Development; vol. 2018-January).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  Open Access
  3 Scopus citations

• Toward seamless wearable sensing: Automatic on-body sensor localization for physical activity monitoring

  Saeedi, R., Purath, J., Venkatasubramanian, K. & Ghasemzadeh, H., Nov 2 2014, 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2014. Institute of Electrical and Electronics Engineers Inc., p. 5385-5388 4 p. 6944843. (2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2014).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  27 Scopus citations

• Towards effective security policy management for heterogeneous network environments

  Teo, L. & Ahn, G. J., 2007, Proceedings - Eighth IEEE International Workshop on Policies for Distributed Systems and Networks, POLICY 2007. p. 241-245 5 p. 4262593. (Proceedings - Eighth IEEE International Workshop on Policies for Distributed Systems and Networks, POLICY 2007).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  4 Scopus citations

• Towards effective sentence simplification for automatic processing of biomedical text

  Jonnalagadda, S., Tari, L., Hakenberg, J., Baral, C. & Gonzalez, G., 2009, NAACL-HLT 2009 - Human Language Technologies: 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics, Short Papers. Ostendorf, M., Collins, M., Narayanan, S., Oard, D. W. & Vanderwende, L. (eds.). Association for Computational Linguistics (ACL), p. 177-180 4 p. (NAACL-HLT 2009 - Human Language Technologies: 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics, Short Papers).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  33 Scopus citations

• Towards efficient neural networks on-a-chip: Joint hardware-algorithm approaches

  Du, X., Krishnan, G., Mohanty, A., Li, Z., Charan, G. & Cao, Y., Mar 2019, China Semiconductor Technology International Conference 2019, CSTIC 2019. Claeys, C., Huang, R., Wu, H., Lin, Q., Liang, S., Song, P., Guo, Z., Lai, K., Zhang, Y., Qu, X., Lung, H-L. & Yu, W. (eds.). Institute of Electrical and Electronics Engineers Inc., 8755608. (China Semiconductor Technology International Conference 2019, CSTIC 2019).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  5 Scopus citations

• Towards enhancing the life of plastic power packages using design optimization

  Rajan, S. & Nagaraj, B., 1995, American Society of Mechanical Engineers, EEP. Vol. 10-1. p. 255-263 9 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  2 Scopus citations

• Towards evolutionary nonnegative matrix factorization

  Wang, F., Tong, H. & Lin, C. Y., Nov 2 2011, AAAI-11 / IAAI-11 - Proceedings of the 25th AAAI Conference on Artificial Intelligence and the 23rd Innovative Applications of Artificial Intelligence Conference. p. 501-506 6 p. (Proceedings of the National Conference on Artificial Intelligence; vol. 1).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  14 Scopus citations

• Towards explainable networked prediction

  Li, L., Tong, H. & Liu, H., Oct 17 2018, CIKM 2018 - Proceedings of the 27th ACM International Conference on Information and Knowledge Management. Paton, N., Candan, S., Wang, H., Allan, J., Agrawal, R., Labrinidis, A., Cuzzocrea, A., Zaki, M., Srivastava, D., Broder, A. & Schuster, A. (eds.). Association for Computing Machinery, p. 1819-1822 4 p. (International Conference on Information and Knowledge Management, Proceedings).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  1 Scopus citations

• Towards explainable representation of time-evolving graphs via spatial-temporal graph attention networks

  Liu, Z., Zhou, D. & He, J., Nov 3 2019, CIKM 2019 - Proceedings of the 28th ACM International Conference on Information and Knowledge Management. Association for Computing Machinery, p. 2137-2140 4 p. (International Conference on Information and Knowledge Management, Proceedings).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  Open Access
  8 Scopus citations

• Towards fatigue and intensity measurement framework during continuous repetitive activities

  Chattopadhyay, R., Pradhan, G. & Panchanathan, S., Oct 18 2010, 2010 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2010 - Proceedings. p. 1341-1346 6 p. 5488258. (2010 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2010 - Proceedings).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  9 Scopus citations

• Towards gain-scheduled H ^∞ control design for a tilt-wing aircraft

  Mix, D. R., Koenig, J. S., Linda, K. M., Cifdaloz, O., Wells, V. & Rodriguez, A., 2004, Proceedings of the IEEE Conference on Decision and Control. Vol. 2. p. 1222-1227 6 p. TuC08.6

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  14 Scopus citations

• Towards generalizable distance estimation by leveraging graph information

  Cava, J. K., Houghton, T. & Yu, H., Oct 2019, Proceedings - 2019 International Conference on Computer Vision Workshop, ICCVW 2019. Institute of Electrical and Electronics Engineers Inc., p. 4603-4605 3 p. 9022009. (Proceedings - 2019 International Conference on Computer Vision Workshop, ICCVW 2019).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

• Towards high-speed, write-disturb tolerant 3D vertical RRAM arrays

  Chen, H. Y., Gao, B., Li, H., Liu, R., Huang, P., Chen, Z., Chen, B., Zhang, F., Zhao, L., Jiang, Z., Liu, L., Liu, X., Kang, J., Yu, S., Nishi, Y. & Wong, H. S. P., Sep 8 2014, Digest of Technical Papers - Symposium on VLSI Technology. Institute of Electrical and Electronics Engineers Inc., 6894434. (Digest of Technical Papers - Symposium on VLSI Technology).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  11 Scopus citations

• Towards HIPAA-compliant healthcare systems

  Wu, R., Ahn, G-J. & Hu, H., 2012, IHI'12 - Proceedings of the 2nd ACM SIGHIT International Health Informatics Symposium. p. 593-601 9 p. (IHI'12 - Proceedings of the 2nd ACM SIGHIT International Health Informatics Symposium).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  22 Scopus citations

• Towards IA-aware web services for federated identity management

  Shenoy, P., Shin, D. & Ahn, G. J., Dec 1 2003, Proceedings of the IASTED International Conference on Communication, Network, and Information Security. Hamza, M. H. (ed.). p. 220-225 6 p. (Proceedings of the IASTED International Conference on Communication, Network, and Information Security).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  5 Scopus citations

• Toward signal processing theory for graphs and non-Euclidean data

  Miller, B. A., Bliss, N. T. & Wolfe, P. J., Nov 8 2010, 2010 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2010 - Proceedings. p. 5414-5417 4 p. 5494930. (ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  42 Scopus citations

• Towards information quality based distribution of multimedia streams in mobile environments

  Gupta, S., Reisslein, M. & Sen, A., 2001, Proceedings of the IEEE Computer Society Workshop on Future Trends of Distributed Computing Systems. p. 25-31 7 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

• Towards integrative gene prioritization in Alzheimer's disease

  Lee, J. H. & Gonzalez, G. H., 2011, Pacific Symposium on Biocomputing 2011, PSB 2011. p. 4-13 10 p. (Pacific Symposium on Biocomputing 2011, PSB 2011).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  5 Scopus citations

• Towards intelligent services: A case study in chemical emergency response

  Bansal, A., Patel, K., Gupta, G., Raghavachari, B., Harris, E. D. & Staves, J. C., Dec 1 2005, Proceedings - 2005 IEEE International Conference on Web Services, ICWS 2005. p. 751-758 8 p. 1530869. (Proceedings - 2005 IEEE International Conference on Web Services, ICWS 2005; vol. 2005).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  11 Scopus citations

• Towards jamming-resistant and competitive medium access in the SINR model

  Richa, A., Zhang, J., Scheideler, C. & Schmid, S., Oct 12 2011, MobiCom'11 - Proceedings of the 17th Annual International Conference on Mobile Computing and Networking and Co-Located Workshops - S3 2011 Workshop, S3'11. p. 33-35 3 p. (Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  4 Scopus citations

• Towards knowledge needs-technology FIT model for knowledge management systems

  Baloh, P. & Desouza, K. C., 2009, Proceedings of the 4th International Conference on Design Science Research in Information Systems and Technology, DESRIST '09. 20. (Proceedings of the 4th International Conference on Design Science Research in Information Systems and Technology, DESRIST '09).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  9 Scopus citations

• Towards large eddy simulation of film-cooling flows on a model turbine blade leading edge

  Peet, Y. & Lele, S. K., 2005, 43rd AIAA Aerospace Sciences Meeting and Exhibit - Meeting Papers. p. 15659-15682 24 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  30 Scopus citations

• Towards lightweight secure communication protocols for passive RFIDs

  Huang, D. & Kapoor, H., Nov 20 2009, 2009 6th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks, SECON 2009. 5168980. (2009 6th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks, SECON 2009).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  3 Scopus citations

• Towards marine bloom trajectory prediction for AUV mission planning

  Das, J., Rajan, K., Frolov, S., Py, F., Ryan, J., Caron, D. A. & Sukhatme, G. S., 2010, 2010 IEEE International Conference on Robotics and Automation, ICRA 2010. p. 4784-4790 7 p. 5509930. (Proceedings - IEEE International Conference on Robotics and Automation).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  42 Scopus citations

• Towards min-cost virtual infrastructure embedding

  Yu, R., Xue, G. & Zhang, X., 2015, 2015 IEEE Global Communications Conference, GLOBECOM 2015. Institute of Electrical and Electronics Engineers Inc., 7416953. (2015 IEEE Global Communications Conference, GLOBECOM 2015).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  3 Scopus citations

• Towards mixed-initiative, multi-robot field experiments: Design, deployment, and lessons learned

  Das, J., Maughan, T., McCann, M., Godin, M., O'Reilly, T., Messié, M., Bahr, F., Gomes, K., Py, F., Bellingham, J. G., Sukhatme, G. S. & Rajan, K., 2011, IROS'11 - 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems: Celebrating 50 Years of Robotics. p. 3132-3139 8 p. 6048826. (IEEE International Conference on Intelligent Robots and Systems).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  22 Scopus citations

• Towards modeling and analysis of cyber-physical medical systems

  Banerjee, A., Gupta, S., Fainekos, G. & Varsamopoulos, G., Dec 1 2011, Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies, ISABEL'11. (ACM International Conference Proceeding Series).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  21 Scopus citations

• Towards modelling defeasible reasoning with imperfection in production rule systems

  Sottara, D., Mello, P. & Proctor, M., 2009, Rule Interchange and Applications - International Symposium, RuleML 2009, Proceedings. p. 345-352 8 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 5858 LNCS).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

• Toward social media based writing

  Sadauskas, J., Byrne, D. & Atkinson, R., 2013, Design, User Experience, and Usability: Health, Learning, Playing, Cultural, and Cross-Cultural User Experience - Second Int. Conference, DUXU 2013, Held as Part of HCI Int. 2013, Proceedings. PART 2 ed. Springer Verlag, p. 276-285 10 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 8013 LNCS, no. PART 2).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  Open Access
  3 Scopus citations

• Towards open network-on-chip benchmarks

  Grecu, C., Ivanov, A., Pande, P., Jantsch, A., Salminen, E., Ogras, U. & Marculescu, R., 2007, Proceedings - NOCS 2007: First International Symposium on Networks-on-Chip. p. 205-212 8 p. 4209009. (Proceedings - NOCS 2007: First International Symposium on Networks-on-Chip).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  25 Scopus citations

• Towards operational validation: Mapping power system inputs to operating conditions

  Schweitzer, E., Xu, T., Birchfield, A. B., Scaglione, A., Overbye, T. J., Thomas, R. J. & Wang, Z., Aug 20 2018, 20th Power Systems Computation Conference, PSCC 2018. Institute of Electrical and Electronics Engineers Inc., 8442880. (20th Power Systems Computation Conference, PSCC 2018).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  2 Scopus citations

• Towards overcoming the knowledge acquisition bottleneck in answer set prolog applications: Embracing natural language inputs

  Baral, C., Dzifcak, J. & Tari, L., 2007, Logic Programming - 23rd International Conference, ICLP 2007, Proceedings. Springer Verlag, p. 1-21 21 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 4670 LNCS).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  3 Scopus citations

• Towards patient-friendly input signal design for optimized pain treatment interventions

  Deshpande, S., Rivera, D. & Younger, J., 2012, SYSID 2012 - 16th IFAC Symposium on System Identification, Final Program. PART 1 ed. IFAC Secretariat, p. 1311-1316 6 p. (IFAC Proceedings Volumes (IFAC-PapersOnline); vol. 16, no. PART 1).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  15 Scopus citations

• Towards PII-based multiparty access control for photo sharing in Online Social Networks

  Vishwamitra, N., Li, Y., Wang, K., Hu, H., Caine, K. & Ahn, G-J., Jun 7 2017, SACMAT 2017 - Proceedings of the 22nd ACM Symposium on Access Control Models and Technologies. Association for Computing Machinery, p. 155-166 12 p. (Proceedings of ACM Symposium on Access Control Models and Technologies, SACMAT; vol. Part F128644).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  27 Scopus citations

• Towards platform level power management in mobile systems

  Kadjo, D., Ogras, U., Ayoub, R., Kishinevsky, M. & Gratz, P., Nov 5 2014, International System on Chip Conference. Shi, K., Buchner, T., Zhao, D. & Sridhar, R. (eds.). IEEE Computer Society, p. 146-151 6 p. 6948916. (International System on Chip Conference).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  14 Scopus citations

• Towards practical framework for collecting and analyzing network-centric attacks

  Paxton, N., Ahn, G. J. & Chu, B., 2007, 2007 IEEE International Conference on Information Reuse and Integration, IEEE IRI-2007. p. 73-78 6 p. 4296600. (2007 IEEE International Conference on Information Reuse and Integration, IEEE IRI-2007).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  12 Scopus citations

• Towards predicting the best answers in community-based question-answering services

  Tian, Q., Zhang, P. & Li, B., 2013, Proceedings of the 7th International Conference on Weblogs and Social Media, ICWSM 2013. AAAI press, p. 725-728 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  53 Scopus citations

• Towards programmable all-digital true random number generator

  Agrawal, R., Bu, L., Del Rosario, E. & Kinsy, M. A., Sep 7 2020, GLSVLSI 2020 - Proceedings of the 2020 Great Lakes Symposium on VLSI. Association for Computing Machinery, p. 53-58 6 p. (Proceedings of the ACM Great Lakes Symposium on VLSI, GLSVLSI).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  1 Scopus citations

• Towards prospective life cycle assessment: Single wall carbon nanotubes for lithium-ion batteries

  Wender, B. A. & Seager, T., Jul 29 2011, Proceedings of the 2011 IEEE International Symposium on Sustainable Systems and Technology, ISSST 2011. 5936889. (Proceedings of the 2011 IEEE International Symposium on Sustainable Systems and Technology, ISSST 2011).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  22 Scopus citations

• Towards realizing a formal RBAC model in real systems

  Ahn, G. J. & Hu, H., 2007, SACMAT'07: Proceedings of the 12th ACM Symposium on Access Control Models and Technologies. p. 215-224 10 p. (Proceedings of ACM Symposium on Access Control Models and Technologies, SACMAT).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  31 Scopus citations

• Towards real-time distributed signal modeling for brain-machine interfaces

  DiGiovanna, J., Marchai, L., Rattanatamrong, P., Zhao, M., Darmanjian, S., Mahmoudi, B., Sanchez, J. C., Príncipe, J. C., Hermer-Vazquez, L., Figueiredo, R. & Fortes, J. A. B., 2007, Computational Science - ICCS 2007 - 7th International Conference, Proceedings, Part I. Springer Verlag, p. 964-971 8 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 4487 LNCS).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

  Open Access
  4 Scopus citations

• Towards real time epidemiology: Data assimilation, modeling and anomaly detection of health surveillance data streams

  Bettencourt, L. M. A., Ribeiro, R. M., Chowell, G., Lant, T. & Castillo-Chavez, C., 2007, Intelligence and Security Informatics: Biosurveillance - Second NSF Workshop, BioSurveillance 2007, Proceedings. Springer Verlag, p. 79-90 12 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 4506 LNCS).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  24 Scopus citations

• Towards realtime measurement of connectedness in human movement

  Krzyzaniak, M., Anirudh, R., Venkataraman, V., Turaga, P. & Wei, S. X., Aug 14 2015, ACM International Conference Proceeding Series. Association for Computing Machinery, Vol. 14-15-August-2015. p. 120-123 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

• Towards real-time neuronal connectivity assessment: A scalable pipelined parallel generalized partial directed coherence engine

  Georgis, G., Menoutis, G., Reisis, D., Tsakalis, K. & Shafique, A. B., Mar 23 2016, 2015 IEEE International Conference on Electronics, Circuits, and Systems, ICECS 2015. Institute of Electrical and Electronics Engineers Inc., p. 13-16 4 p. 7440237. (Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems; vol. 2016-March).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

• Towards Real Time Team Optimization

  Zhou, Q., Li, L. & Tong, H., Dec 2019, Proceedings - 2019 IEEE International Conference on Big Data, Big Data 2019. Baru, C., Huan, J., Khan, L., Hu, X. T., Ak, R., Tian, Y., Barga, R., Zaniolo, C., Lee, K. & Ye, Y. F. (eds.). Institute of Electrical and Electronics Engineers Inc., p. 1008-1017 10 p. 9006078. (Proceedings - 2019 IEEE International Conference on Big Data, Big Data 2019).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  2 Scopus citations

• Towards retrieval of visual information based on the semantic models

  Park, Y., Kim, P., Kim, W., Song, J. & Panchanathan, S., 2002, Database and Expert Systems Applications - 13th International Conference, DEXA 2002, Proceedings. Hameurlain, A., Cicchetti, R. & Traunmuller, R. (eds.). Springer Verlag, p. 841-850 10 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 2453).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

• Towards role-based authorization for OSGi service environments

  Ahn, G-J., Hu, H. & Jin, J., 2008, Proceedings of the IEEE Computer Society Workshop on Future Trends of Distributed Computing Systems. p. 23-29 7 p. 4683110

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  5 Scopus citations

• Towards scalable application checkpointing with parallel file system delegation

  Arteaga, D. & Zhao, M., Sep 22 2011, Proceedings - 6th IEEE International Conference on Networking, Architecture, and Storage, NAS 2011. p. 130-139 10 p. 6005432. (Proceedings - 6th IEEE International Conference on Networking, Architecture, and Storage, NAS 2011).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  4 Scopus citations

• Towards scalable authentication in health services

  Ahn, G. J. & Shin, D., 2002, Proceedings - 11th IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises, WET ICE 2002. IEEE Computer Society, p. 83-88 6 p. 1029993. (Proceedings of the Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises, WETICE; vol. 2002-January).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  2 Scopus citations

• Towards secure information sharing and management in grid environments

  Jin, G. & Ahn, G-J., 2006, 2006 International Conference on Collaborative Computing: Networking, Applications and Worksharing, CollaborateCom. 4207564

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
  2 Scopus citations