VAINIO, J. V. On the type of sewing functions with a singularity. Annales Fennici Mathematici, [S. l.], v. 14, n. 1, p. 161–167, 1989. DOI: 10.5186/aasfm.1989.1432. Disponível em: https://afm.journal.fi/article/view/134656. Acesso em: 25 nov. 2024.