Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

R. W. Schmidt, T. Kundic, U. L. Pen, E. L. Turner, J. Wambsganss, L. E. Bergeron, W. N. Colley, C. Corson, N. C. Hastings, T. Hoyes, D. C. Long, K. A. Loomis, S. Malhotra, J. E. Rhoads, K. Z. Stanek