TY  - GEN
AU  - Schneider,P.
AU  - Ehlers,J.
AU  - Falco,E.E.
TI  - Gravitational lenses
T2  - Astronomy and astrophysics library
SN  - 3540665064
U1  - 522.6 
PY  - 1999///
CY  - [S.l.]
PB  - Springer
ER  -