TY  - BOOK
AU  - Schneider,P.
AU  - Ehlers, J.
AU  - Falco, E.E.
TI  - Gravitational Lenses
SN  - 3-540-66506-4
CY  - Berlin
KW  - Optics-Curved space time
KW  - Cosmology
KW  - lenses-Properties
ER  -