Kruse, Robert L.. <br/><br/>
Nilpotent Rings /  

 - 1st ed /  
 - New York 10011 :   Gordon and Breach, Science Publishers, Inc. 
 - p.127 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ring Theory
<br/><br/><label>Dewey Class. No.: </label>B25  / K9K