Relational database systems :  analysis and comparison / 
edited by Joachim W. Schmidt and Michael L. Brodie. 
 - Berlin  :  Springer-Verlag,  1983. 
 - xiii, 618 p.  ;  25 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0387120327 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Database management.<br/>Information storage and retrieval systems.