MIKKOLA, K. M. Hankel and Toeplitz operators on nonseparable Hilbert spaces. Annales Fennici Mathematici, [S. l.], v. 34, n. 1, p. 109–129, 2009. Disponível em: https://afm.journal.fi/article/view/135255. Acesso em: 14 apr. 2025.