TY  - BOOK
AU  - CHOPRA, K.L.
AU  - SEHGAL, N.K.
AU  - SEHGAL, D.L.
TI  - MODERN PHYSICS
U1  - 539 
PY  - 1988///
CY  - New Delhi
PB  - Sultan Chand and Sons, New Delhi 
ER  -