Petrich, Mario. <br/><br/>
Introduction to semigroups. 

 - Columbus, Ohio  Merrill  [1973] 
 - viii, 198 p.  24 cm. 
 - Merrill research and lecture series .
<br/><br/> 920327 
<br/><br/>Bibliography: p. 183-194. 
<br/><br/><label>ISBN: </label>0675090628 
<br/><br/><label>LCCN: </label>72078086 //r902 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Semigroups.
<br/><br/><label>LC Class. No.: </label>QA171  / .P43 
<br/><br/><label>Dewey Class. No.: </label>512/.2