Petrich, Mario <br/><br/>
Categories of algebraic systems, vectors and projective spaces, semigroups, rings and lattices  / 

 - Berlin:  Springer-Verlag,  1976 
 - viii, 217p. Index 
 - Lecture notes in Mathematics  553 .
<br/><br/><label>Dewey Class. No.: </label>512  / P495.CA