Trivial extensions of Abelian categories : homological algebra of trivial extensions of Abelian categories with applications to ring theory / Robert M. Fossum, Phillip A. Griffith, Idun Reiten. (Lecture notes in mathematics ; 456)
Trivial extensions of Abelian categories : homological algebra of trivial extensions of Abelian categories with applications to ring theory / Robert M. Fossum, Phillip A. Griffith, Idun Reiten.