HEDBERG, Lars Inge. Weighted Mean Approximation in Carathéodory Regions. Mathematica Scandinavica, Berkeley, CA, United States, v. 23, p. 113–122, 1968. DOI: 10.7146/math.scand.a-10902. Disponível em: https://journals.msp.org/mscand/article/view/2448. Acesso em: 25 jul. 2026.