Ellis, David  <br/><br/>
Progress problems in information retrieval 

 - 2nd ed.  
 - London:   Library Association Publishing,   1996 
 - xx, 220p.  
<br/><br/><label>ISBN: </label>1-85604-123-9 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science 
<br/><br/><label>Subjects--Index Terms: </label>Information retrieval  
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.4   / N6