KURBONOVA, Y. R. Hilbert fazosidagi chiziqli operatorlar va o’z-o’ziga qo’shma operatorlar spektri haqida. Science and Education, [S. l.], v. 4, n. 2, p. 19–33, 2023. Disponível em: https://openscience.uz/index.php/sciedu/article/view/4989. Acesso em: 6 may. 2024.