TY  - BOOK
AU  - Lancaster,F.Wilfrid
TI  - Information retrieval systems: characteristics, testing, and evaluation 
SN  - 0471046736
PY  - 1979///
CY  - New York
PB  - Wiley
KW  - Information storage and retrieval systems
N1  - 'A Wiley-Interscience publication.'; Includes index; Bibliography: p. 359-373
ER  -