KARACHIK, V.; TURMETOV, B. On spectral problems for nonlocal analogues of the polyharmonic operator. Eurasian Mathematical Journal, [S. l.], v. 17, n. 3, p. 31–43, 2026. DOI: 10.32523/2077-9879-2026-17-3-31-43. Disponível em: https://emj.enu.kz/index.php/main/article/view/1095. Acesso em: 9 oct. 2026.