TY  - BOOK
AU  - Heaps,H.S.
TI  - Information retrieval: computational and theoretical aspects 
SN  - 0123357500 :
U1  - 010.78 
PY  - 1978///
CY  - New York
PB  - Academic Press
KW  - Information storage and retrieval systems
N1  - Includes bibliographical references and index
ER  -