00662nam0-2200253 --450 991023135880332120171211131706.020171211d1965----km y0itay50 baengGB 001yyOn retrieval system theoryby B. C. Vickery2nd ed.LondonButterworths1965XII, 191 p.ill.21 cmLogicaVickery,B. C.7279ITUNINAREICATUNIMARCBK9910231358803321II 1852389DINEDDINEDOn retrieval system theory885081UNINA