Grahne, G. <br/><br/>
The problem of incomplete information in relational databases 

 - Berlin :  Springer-Verlag,  1991 
 - 156 p. 
 - Lecture notes in computer science ;  no. 554 .
<br/><br/><label>ISBN: </label>3540549196 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reasoning<br/>Logic, Symbolic and mathematical<br/>Artificial intelligence
<br/><br/><label>LC Class. No.: </label>Q335  / G83