Gravitational lensing : proceedings of a workshop held in Toulouse, France, September 13-15, 1989 - Mellier, Y. (Yannick), 1958-; Fort, B. (Bernard), 1942-; Soucail, G. (Geneviève), 1962- (Berlin : Springer-Verlag, 1990)
Includes bibliographical references.
Keywords: Gravitational lenses -- Congresses; Quasars -- Congresses