TY  - BOOK
AU  - Asimov,Isaac
TI  - The collapsing universe
SN  - 9780802704863
AV  - QB843 
PY  - 1977///
CY  - New York
PB  - Walker
KW  - Black holes (Astronomy)
KW  - Astronomy
N1  - 4; 2
ER  -