BAAS, Nils A.; MADSEN, Ib. On the Realization of Certain Modules over the Steenrod Algebra. Mathematica Scandinavica, Berkeley, CA, United States, v. 31, p. 220–224, 1972. DOI: 10.7146/math.scand.a-11427. Disponível em: https://journals.msp.org/mscand/article/view/2218. Acesso em: 25 jul. 2026.