Van Rijsbergen, C. J.,   1943- <br/><br/>
Information retrieval /  [Book]. 
C. J. van Rijsbergen.  
 - 2nd ed. 
 - London ;   Boston :   Butterworths,   1979. 
 - ix, 208 p. :   ill. ;   23 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p [192]-204. 
<br/><br/><label>ISBN: </label>0408709294 (PAPERBACK) 
<br/><br/><label>LCCN: </label>78040725 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information storage and retrieval systems.