LEUNG, Y. J.; SCHOBER, G. Low order coefficient estimates in the class Σ. Annales Fennici Mathematici, [S. l.], v. 11, n. 1, p. 39–61, 1986. DOI: 10.5186/aasfm.1986.1111. Disponível em: https://afm.journal.fi/article/view/134561. Acesso em: 25 nov. 2024.