Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998
R. W. Schmidt, T. Kundić, 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 and K. Z. Stanek
A&A, 392 3 (2002) 773-779
DOI: https://doi.org/10.1051/0004-6361:20020957
