TY - BOOK AU - Kayser,R. AU - Schramm,T. AU - Nieser,L. TI - Gravitational lenses: proceedings of a conference held in Hamburg, Germany, 9-13 September 1991 T2 - Lecture notes in physics SN - 3540557970 (Berlin) : AV - QB857.5.G7 G733 1992 U1 - 523.1/12 20 PY - 1992/// CY - Berlin PB - Springer-Verlag KW - Gravitational lenses KW - Congresses KW - Astrophysics N1 - Includes bibliographical references and indexes ER -