Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Fossum, R. and Griffith, Phillip A. and Reiten, Idun",Trivial extensions of Abelian categories : homological algebra of trivial extensions of Abelian categories with applications to ring theory,,Springer-Verlag,1975,Lecture notes in mathematics,,"3540071598,0387071598",,https://cir.nii.ac.jp/crid/1130000794057987328