JENSEN, Chr. U. Homological Dimensions of $\aleph_0$-Coherent Rings. MATHEMATICA SCANDINAVICA, [S. l.], v. 20, p. 55–60, 1967. DOI: 10.7146/math.scand.a-10819. Disponível em: https://tidsskrift.dk/math/article/view/10819. Acesso em: 13 aug. 2026.