KOCK, A.; KRISTENSEN, L.; MADSEN, I. Cochain Functors for General Cohomology Theories I. MATHEMATICA SCANDINAVICA, [S. l.], v. 20, p. 131–150, 1967. DOI: 10.7146/math.scand.a-10827. Disponível em: https://tidsskrift.dk/math/article/view/10827. Acesso em: 14 aug. 2026.