KOCK, A.; KRISTENSEN, L.; MADSEN, I. Cochain Functors for General Cohomology Theories I. Mathematica Scandinavica, Berkeley, CA, United States, v. 20, p. 131–150, 1967. DOI: 10.7146/math.scand.a-10827. Disponível em: https://journals.msp.org/mscand/article/view/2498. Acesso em: 25 jul. 2026.