TY  - BOOK
AU  - Lawden, Derek F.  .
TI  - Introduction to tensor calculas and relativity / 
SN  - 0-412-20370-7
U1  - CN 
PY  - 1967///
CY  - New Delhi : 
PB  - Navayug Traders , 
KW  - Relativity
ER  -