WALLIN, H. Existence and Properties of Riesz Potentials Satisfying Lipschitz Conditions. MATHEMATICA SCANDINAVICA, [S. l.], v. 19, p. 151–160, 1966. DOI: 10.7146/math.scand.a-10804. Disponível em: https://www.mscand.dk/article/view/10804. Acesso em: 1 may. 2024.