1. Exact Categories;Barr,1971
2. Biduale algebren;Beutler,1979
3. Mal'cev, Protomodular, Homological and Semi-Abelian Categories;Borceux,2004
4. Jordan-Hölder, modularity and distributivity in non-commutative algebra;Borceux;J. Pure Appl. Algebra,2007
5. Normalization Equivalence, Kernel Equivalence, and Affine Categories;Bourn,1991