TY  - BOOK
AU  - Dhawan, K.S.  .
TI  - Principles of information retrieval / 
SN  - 81-7169-484-5
U1  - 2:(BV) 
PY  - 1997///
CY  - New Delhi : 
PB  - Commonwealth publishers , 
KW  - Library- Information Retrieval
ER  -