BURENKOV, V.; OTELBAEV, M. On the singular numbers of correct restrictions of non-selfadjoint elliptic differential operators. Eurasian Mathematical Journal, [S. l.], v. 2, n. 1, 2024. Disponível em: https://emj.enu.kz/index.php/main/article/view/75. Acesso em: 5 oct. 2024.