Natural language question answering systems /  [Books]. 
edited by Leonard Bolc.  
 - London ;   The Macmillan Press Ltd. ;  ©1980. 
 - 305 pages :   illustrations ;   21cm. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0333295285 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Question-answering systems