LANDWEBER, Peter S. Elements of Infinite Filtration in Complex Cobordism. Mathematica Scandinavica, Berkeley, CA, United States, v. 30, p. 223–226, 1972. DOI: 10.7146/math.scand.a-11077. Disponível em: https://journals.msp.org/mscand/article/view/2247. Acesso em: 25 jul. 2026.