Ahrens, Friedhelm <br/><br/>
Datenbanksysteme 

 -  De Gruyter  1971 
 - 1 electronic resource (152 p.) 
<br/><br/> Open Access 
<br/><br/><br/>Creative Commons 
<br/><br/><br/>German 
<br/><br/><label>ISBN: </label>9783111669489 9783111669489 
<br/><br/><label>Standard No.: </label>10.1515/9783111669489  doi