XU, Y.; CHEN, D.; CHEN, D. The Landau problem for univalent bounded nonvanishing functions. Tamkang Journal of Mathematics, [S. l.], v. 35, n. 2, p. 101-104, 2004. DOI: 10.5556/j.tkjm.35.2004.210. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/210. Acesso em: 26 may. 2022.