SZ.-NAGY, B.; CIPRIAN, F. On contractions similar to isometries and Toeplitz operators. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 553–564, 1976. DOI: 10.5186/aasfm.1976.0234. Disponível em: https://afm.journal.fi/article/view/134313. Acesso em: 25 nov. 2024.