TY  - BOOK
AU  - Sachs R K
AU  -  Wu H
TI  - General relativity for mathematicians
T2  - Graduates texts in Mathematics; 48
U1  - CN0bB, L7 
PY  - 1977///
CY  - New York    
PB  -  Spring- Verlag       
KW  -  General relativity
KW  - Physics
ER  -