TY  - BOOK
AU  - Van Rijsbergen,C.J.
TI  - Information retrieval
SN  - 0408709294 (PAPERBACK)
PY  - 1979///
CY  - London ; , Boston : 
PB  - Butterworths, 
KW  - Information storage and retrieval systems
N1  - Includes index; Bibliography: p [192]-204
ER  -