PILIPENKO, A. Yu. On local operators diagonal with respect to the system of Hermitian polynomials. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 4, p. 555–561, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5457. Acesso em: 5 dec. 2025.