KOSHANOV, B. D.; SOLDATOV, A.P. On the solvability of the boundary value problems for the elliptic equation of high order on a plane. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 91, n. 3, p. 24–30, 2018. DOI: 10.31489/2018m3/24-30. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/203. Acesso em: 10 jul. 2025.