SIEJKA, Henryka. On estimating some initial inverse coefficients for meromorphic univalent functions omitting a disc. Mathematica Scandinavica, Berkeley, CA, United States, v. 60, p. 229–238, 1987. DOI: 10.7146/math.scand.a-12182. Disponível em: https://journals.msp.org/mscand/article/view/1444. Acesso em: 25 jul. 2026.