Ergashev, T. и Okboev, A. (2026) «Boundary Value Problems with Mixed Dirichlet and Neumann Conditions for Three-Dimensional Degenerate Elliptic Equation», Journal of Osh State University. Differential Equations, (1), сс. 93–. доступно на: https://journal.oshsu.kg/index.php/diffeq/article/view/3945 (просмотрено: 18 август 2026).