LEHTINEN, M. Estimates of the inner radius of univalency of domains bounded by conic sections. Annales Fennici Mathematici, [S. l.], v. 10, n. 1, p. 349–353, 1985. DOI: 10.5186/aasfm.1985.1038. Disponível em: https://afm.journal.fi/article/view/134533. Acesso em: 25 nov. 2024.