Kochen, Manfred. <br/><br/>
Principles of information retrieval. 

 - Los Angeles :  Melville Publishing,  1974. 
 - xix, 203 p. :  ill. ;  23 cm. 
<br/><br/> 'A Wiley-Becker & Hayes series book.' 
<br/><br/>p. 177-195. 
<br/><br/><label>ISBN: </label>0471496979 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information storage and retrieval systems.