TY  - BOOK
AU  - Levi-Civita, Tullio
AU  - Dougall, John
TI  - A simplified presentation of Einsten's unified  field equations
SN  - 0070043779
U1  - 530.11 
PY  - 1949///?]
CY  - London
PB  - Blackie & Son Ltd.
N1  - L
ER  -