NUMMELIN, E. On the Poisson equation in the potential theory of a single kernel. Mathematica Scandinavica, Berkeley, CA, United States, v. 68, p. 59–82, 1991. DOI: 10.7146/math.scand.a-12346. Disponível em: https://journals.msp.org/mscand/article/view/1283. Acesso em: 24 jul. 2026.