TY  - GEN
AU  - Rijsbergen, C. J. Van,
AU  - Robertson, S. E
TI  - Information retrieval research
SN  - 0408107758
U1  - 025.524 
PY  - 1981///
CY  - London
PB  - Butterworths
KW  - Computer data processing
N1  - Includes index
ER  -