KRÓL-KLIMKOWSKA, E.; PTAK, M. Properties of two variables Toeplitz type operators. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 15, p. 97–106, 2016. Disponível em: https://studmath.uken.krakow.pl/article/view/13145. Acesso em: 31 oct. 2026.