GUBREEV, G. M.; DOLGOPOLOVA, M. V.; NEDOBACHIY, S. I. A spectral decomposition in one class of non-selfadjoint operators. Methods of Functional Analysis and Topology, [S. l.], v. 16, n. 2, p. 140–157, 2010. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/447. Acesso em: 16 dec. 2025.