BRUNDIN, Martin. Approach regions for $l^{p}$ potentials with respect to the square root of the Poisson kernel. Mathematica Scandinavica, Berkeley, CA, United States, v. 96, n. 2, p. 243–256, 2005. DOI: 10.7146/math.scand.a-14955. Disponível em: https://journals.msp.org/mscand/article/view/742. Acesso em: 24 jul. 2026.