TY  - BOOK
AU  - Belkin, N.J. Van Rijsbergen, C.J.
AU  - Annual International ACMSIGIR Conference on Research and Development in Information Retrieval. Cambridge 1989
TI  - SIGIR '89: proceedings /ed. by N.J.Belkin and C.J.Van Rijsbergen
SN  - 0897913213
U1  - 025.04 
PY  - 1989///
CY  - New York
PB  - ACM
ER  -