The multiple quasar Q2237+0305 under a microlensing caustic T. Anguita, R. W. Schmidt, E. L. Turner, J. Wambsganss, R. L. Webster, K. A. Loomis, D. Long and R. McMillan A&A, 480 2 (2008) 327-334 Published online: 02 January 2008 DOI: 10.1051/0004-6361:20078221