SOLOVIEV, S. Proof of a Conjecture of S. Mac Lane. BRICS Report Series, [S. l.], v. 3, n. 61, 1996. DOI: 10.7146/brics.v3i61.18773. Disponível em: https://tidsskrift.dk/brics/article/view/18773. Acesso em: 19 apr. 2024.