BERDYSHEV, A.; HASANOV, A.; RYSKAN, A. Solution of the Neumann Problem for One Four-Dimensional Elliptic Equation. Eurasian Mathematical Journal, [S. l.], v. 11, n. 2, p. 93–97, 2020. DOI: 10.32523/2077-9879-2020-11-2-93-97. Disponível em: https://emj.enu.kz/index.php/main/article/view/183. Acesso em: 30 sep. 2026.