KOEPF, W. Close-to-convex functions and linear-invariant families. Annales Fennici Mathematici, [S. l.], v. 8, n. 2, p. 349–355, 1983. DOI: 10.5186/aasfm.1983.0815. Disponível em: https://afm.journal.fi/article/view/134476. Acesso em: 25 nov. 2024.