1. Cohomology in tensored categories;Barr,1966
2. Acyclic models and triples;Barr,1966
3. Cohomology as the derived functor of derivations;Barr;Trans. Am. Math. Soc.,1966
4. Triples, Algebras and Cohomology;Beck,1967
5. Adjoint functors and triples;Eilenberg;Illinois J. Math.,1965