LARIONOV, E. On Stability of Bases in Hilbert Spaces. Eurasian Mathematical Journal, [S. l.], v. 11, n. 2, p. 65–71, 2020. DOI: 10.32523/2077-9879-2020-11-2-65-71. Disponível em: https://emj.enu.kz/index.php/main/article/view/180. Acesso em: 21 oct. 2026.