APANASOV, Boris N. Quasisymmetric embeddings of a closed ball inextensible in neighbourhoods of any boundary points. Annales Fennici Mathematici, [S. l.], v. 14, n. 2, p. 243–255, 1989. DOI: 10.5186/aasfm.1989.1401. Disponível em: https://afm.journal.fi/article/view/134661. Acesso em: 9 dec. 2025.