Petrich, M. <br/><br/>
Introduction to semigroups / 
Mario Petrich. 
 - Columbus, Ohio :  Charles E. Merrill,  1973. 
 - viii, 198 p. ;  24 cm. 
 - Merrill research and lecture series. .
<br/><br/>Bibliography : p. 183-194. 
<br/><br/><label>ISBN: </label>0675090628 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Semigroups.