The structure of the relational database model / 
Jan Paredaens ... et al. 
 - Berlin :  Springer-Verlag,  1989. 
 - 231 p. ;  25 cm. 
 - EATCS monographs on theoretical computer science;  v. 17. .
<br/><br/><label>ISBN: </label>0387137149 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data base management.<br/>Relational data bases.