DANCHEV, P. V.; KEEF, P. W. Generalized Wallace theorems. MATHEMATICA SCANDINAVICA, [S. l.], v. 104, n. 1, p. 33–50, 2009. DOI: 10.7146/math.scand.a-15083. Disponível em: https://www.mscand.dk/article/view/15083. Acesso em: 11 apr. 2025.