GUMENYUK, P. On existence of Becker extension. Annales Fennici Mathematici, [S. l.], v. 47, n. 2, p. 979–1005, 2022. DOI: 10.54330/afm.120591. Disponível em: https://afm.journal.fi/article/view/120591. Acesso em: 17 aug. 2022.