Categorie omologiche Paolo Boero (1965) Rendiconti del Seminario Matematico della Università di Padova
Characterization of protomodular varieties of universal algebras. Bourn, Dominique, Janelidze, George (2003) Theory and Applications of Categories [electronic only]
Closedness properties of internal relations. IV: Expressing additivity of a category via subtractivity. Janelidze, Zurab (2006) Journal of Homotopy and Related Structures
Closure operators in exact completions. Menni, Matías (2001) Theory and Applications of Categories [electronic only]
Cohomology without projectives Dominique Bourn, Diana Rodelo (2007) Cahiers de Topologie et Géométrie Différentielle Catégoriques
Comparing coequalizer and exact completions. Pedicchio, M.C., Rosický, Jiří (1999) Theory and Applications of Categories [electronic only]
Construction de théories d'exactitude Luc Van den Bril (1986) Cahiers de Topologie et Géométrie Différentielle Catégoriques