Ergashev, Tuhtasin, и Akmaljon Okboev. «Boundary Value Problems With Mixed Dirichlet and Neumann Conditions for Three-Dimensional Degenerate Elliptic Equation». Journal of Osh State University. Differential Equations, no. 1 (февраль 3, 2026): 93–. просмотрено август 19, 2026. https://journal.oshsu.kg/index.php/diffeq/article/view/3945.