TY  - BOOK
AU  - Penrose, Roger
AU  - Hawking, StephenPenrose, Roger
TI  - The Nature of Space and Time
SN  - 195642112
AV  - 530 
U1  - 530 HAW 
PY  - 1997///
CY  - Oxford University press
PB  - Delhi
KW  - Physics
ER  -