JOHANSSON, Bo I. a high indices theorem without a nontrivial solution. Mathematica Scandinavica, Berkeley, CA, United States, v. 106, n. 1, p. 23–38, 2010. DOI: 10.7146/math.scand.a-15122. Disponível em: https://journals.msp.org/mscand/article/view/575. Acesso em: 24 jul. 2026.