STROM, Arne. Note on Cofibrations II. MATHEMATICA SCANDINAVICA, [S. l.], v. 22, p. 130–142, 1968. DOI: 10.7146/math.scand.a-10877. Disponível em: https://tidsskrift.dk/math/article/view/10877. Acesso em: 14 aug. 2026.