YOUNG, G. S. Extensions of Liouville’s Theorem to $n$ Dimensions. MATHEMATICA SCANDINAVICA, [S. l.], v. 6, p. 289–292, 1958. DOI: 10.7146/math.scand.a-10553. Disponível em: https://www.mscand.dk/article/view/10553. Acesso em: 5 may. 2024.