1. Exact categories;Barr,1971
2. Handbook of Categorical Algebra, vol. 2;Borceux,1994
3. Mal'cev, Protomodular, Homological and Semi-Abelian Categories;Borceux,2004
4. Topological semi-abelian algebras;Borceux;Adv. Math.,2005
5. Galois Theories;Borceux,2001