Vickery, B. C. <br/><br/>
On retrieval system theory 

 - London:   Butterworths,   1961 
 - x, 159p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information retrieval
<br/><br/><label>Subjects--Index Terms: </label>Description Automation Discriptor languages 
<br/><br/><label>Universal Decimal Class. No.: </label>D 002:025.4  / K11