Petrich, Mario <br/><br/>
Lectures in semigroups 
Mario Petrich 
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 - John Wiley & Sons, London  1972 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>Groups-- Algebra-- Mathematics
<br/><br/><label>Dewey Class. No.: </label>512.2  PET-L