TY  - BOOK
A1  - Petters, Arlie O.
A1  - Levine, Harold
A1  - Wambsganß, Joachim
T1  - Singularity theory and gravitational lensing
T3  - Progress in mathematical physics
Y1  - 2001
SN  - 0-8176-3668-4
VL  - 21
PB  - Birkhäuser
CY  - Boston
ER  -