FIFE, J. H. Triple products in the Steenrod algebra. MATHEMATICA SCANDINAVICA, [S. l.], v. 55, p. 201–215, 1984. DOI: 10.7146/math.scand.a-12076. Disponível em: https://www.mscand.dk/article/view/12076. Acesso em: 2 may. 2024.