Walker, Stephen  <br/><br/>
Improving subject retrieval in online catalogues:  2. Relevance feedback and query expansion  

 - Britain:   British Library Research,   1990   
 - 115p.  
<br/><br/><label>ISBN: </label>0-7123-3219-7  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Improving subject 
<br/><br/><label>Subjects--Index Terms: </label>online catalogues  Research paper  
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.4:681.32   / N0