APANASOV, B. N. Topological barriers for locally homeomorphic quasiregular mappings in 3-space. Annales Fennici Mathematici, [S. l.], v. 43, n. 2, p. 579–596, 2018. DOI: 10.5186/aasfm.2018.4337. Disponível em: https://afm.journal.fi/article/view/135746. Acesso em: 20 maj. 2024.