TY  - BOOK
AU  - Bhatt p ,
TI  - Indian journal of pure  and Applied Physics Vol 50 , No 1-12 , 
SN  - 0019-5596
U1  - 050 
PY  - 2012///
CY  - [s.l]
PB  - National Institute of Scioence Communication and Information resources
ER  -