Petrich, Mario <br/><br/>
Rings and semigroups / 
by Mario Petrich ; With an appendix by Richard Wiegandt 
 - Berlin :  Springer-Verlag,  1974 
 - viii, 182 p. ;  24 cm. 
 - Lecture notes in mathematics no. 380 .
<br/><br/>Bibliography : p. 168-174 
<br/><br/><label>ISBN: </label>0387067302 :  DM 18.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Semigroups<br/>Associative rings
<br/><br/><label>Dewey Class. No.: </label>510.82