Feigelstock, S. <br/><br/>
Additive groups of rings/ 
S. Feigelstock. 
 - [1st ed.] 
 - Boston:  Pitman,  1984. 
 - 113 p. 
 - Pitman Research Notes in Mathematics Series;  83. .
<br/><br/><label>Dewey Class. No.: </label>512.2