NUMMELIN, E. On the Poisson equation in the potential theory of a single kernel. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 59–82, 1991. DOI: 10.7146/math.scand.a-12346. Disponível em: https://www.mscand.dk/article/view/12346. Acesso em: 5 may. 2024.