TY  - BOOK
AU  - Richtmyer, F K  .
AU  - Cooper ,John N  .
AU  - Kennard,E H  .
TI  - Introduction to modern physics / 
U1  - 539 
PY  - 1990///
CY  - New Delhi : 
PB  - Tata Mc-Graw Hill Publishing Company , 
ER  -