TY  - BOOK
AU  - Duggal, Krishan.L.
TI  - Null Curves and Hypersurfaces of Semi -Riemannian Manifolds 
SN  - 9789812706478
U1  - 516.07 
PY  - 2007///
CY  - Singapore
PB  - World Scientific
KW  - Mathematics
ER  -