A Universal Coefficient Theorem for Categories with Kernels. Ararat Babakhanian (1971) Mathematische Zeitschrift
A universal construction in Goursat categories Marino Gran, Diana Rodelo (2008) Cahiers de Topologie et Géométrie Différentielle Catégoriques
A useful category for mixed Abelian groups. Gălugăreanu, Grigore (1999) Theory and Applications of Categories [electronic only]
Abelian groupoids and non-pointed additive categories. Bourn, Dominique (2008) Theory and Applications of Categories [electronic only]
Action groupoid in protomodular categories. Bourn, Dominique (2006) Theory and Applications of Categories [electronic only]
Additive Duality at Cosmall Injectives B. A. Rattray, J. Lambek (1977) Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
Almost abelian categories Wolfgang Rump (2001) Cahiers de Topologie et Géométrie Différentielle Catégoriques