Pollak, G. <br/><br/>
Algebraic Theory Of Semigroups  
/ edited by G. Pollak 
 - New York;  North-Holland Publishing Company:  1979. 
 - 753p. 
 - Colloquia Mathematica  Societatis Janos Bolyai, 20. .
<br/><br/><label>ISBN: </label>0444852824 
<br/><br/><label>Dewey Class. No.: </label>512.22  / POL/A