Fossum, Robert M. <br/><br/>
Trivial extensions of abelian categories  : Homological algebra of trivial extensions of abelian categories with applications to ring theory / 

 - Berlin:  Springer-Verlag,  1975 
 - xi, 122p. 
 - Lecture notes in Mathematics   456 .
<br/><br/><label>Dewey Class. No.: </label>512  / F752.TE