Petrich, Mario <br/><br/>
Categories of algebraic systems 
Mario Petrich 
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 - Springer-Verlag, Berlin  1976 
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 - Lecture Notes in Mathematics, No.0553 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lecture Notes in Mathematics
<br/><br/><label>Dewey Class. No.: </label>R  LNM.0553