Text ( visual ) : unmediated 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. -- : Germany ; : U.S.. -- Berlin ; New York : Springer-Verlag , 1975. -- xi, 122 p. ; 24 cm. -- (Lecture notes in mathematics ; 456). -- Bibliography: p. [117]-122. -- ISBN 3540071598 ; 0387071598 ; (BA06381501) ; https://ci.nii.ac.jp/ncid/BA06381501 Author Heading(s): Fossum, R. ; Griffith, Phillip A. ; Reiten, Idun. -- Classification(s): LCC : QA3 ; LCC : QA251.3 ; DC : 510/.8 s ; DC : 512/.55. -- Subject Heading(s): LCSH : Commutative rings ; LCSH : Associative rings ; LCSH : Abelian categories