Light curves of OJ 287, 3C 66A, AO 0235+164 and S5 0716+714 observed during the OJ-94 project - Sillanpää, Aimo; Heidt, Jochen; Wagner, Stefan; Bock, Holger Arne; Kümmel, Martin W. (Workshop on two years of intensive monitoring of OJ 287 and 3C66A, 1996)