TY  - BOOK
AU  - Sachs, B.K..
TI  - General Relativity and Cosmology / 
U1  - B9:80aCN 
PY  - 1989///
CY  - New York-3,N.Y. : 
PB  - Academic Press Inc. , 
KW  - Mathematics <Cosmology><Relativity>
ER  -