1. Exact Categories;Barr,1971
2. Homology and standard constructions;Barr,1969
3. Mal’cev, protomodular, homological and semi-abelian categories;Borceux;Math. Appl.,2004
4. Topological semi-abelian algebras;Borceux;Adv. Math.,2005
5. Galois Theories;Borceux,2001