KRAINES, David. Twisted Multiplications on Generalized Eilenberg-Maclane Spaces. MATHEMATICA SCANDINAVICA, [S. l.], v. 32, p. 273–285, 1973. DOI: 10.7146/math.scand.a-11463. Disponível em: https://tidsskrift.dk/math/article/view/11463. Acesso em: 13 aug. 2026.