Stefano Ceri,G Gottolob,L Tanca <br/><br/>
Logic Programming and Databases 

 - 
 -  Springer-Verlag  1990 
 - 284 
<br/><br/>  
<br/><br/><label>ISBN: </label>3-540-51728-6 
<br/><br/><label>Dewey Class. No.: </label>004.65