TY  - BOOK
AU  - Petters Arlie O ; Levine Harold ; Wambsganss, Joachim
TI  - Singularity theory and gravitational lensing
SN  - 9780817636685
AV  - QB 857.5 
PY  - 2001///
CY  - Boston
PB  - Birkhauser
ER  -