DANCHEV, Peter V.; KEEF, Patrick W. Generalized Wallace theorems. Mathematica Scandinavica, Berkeley, CA, United States, v. 104, n. 1, p. 33–50, 2009. DOI: 10.7146/math.scand.a-15083. Disponível em: https://journals.msp.org/mscand/article/view/614. Acesso em: 24 jul. 2026.