OHM, J. An axiomatic approach to homological dimension. MATHEMATICA SCANDINAVICA, [S. l.], v. 37, p. 197–222, 1975. DOI: 10.7146/math.scand.a-11602. Disponível em: https://www.mscand.dk/article/view/11602. Acesso em: 29 apr. 2024.