Petrich, Mario <br/><br/>
Rings and Semigroups 
Mario Petrich 
 - Berlin, Heidelberg, New York  Springer  1974 
 - VIII, 182 p  24 cm 
 - Lecture Notes in Mathematics  380 .
<br/><br/> Contine bibliografie si index 
<br/><br/><label>ISBN: </label>3540067302 
<br/><br/><label>Dewey Class. No.: </label>510