Salakhitdinov, Makhmud Salakhitdinovich, and Anvar Hasanov. “The Dirichlet Problem for the Generalized Bi-Axially Symmetric Helmholtz Equation”. Eurasian Mathematical Journal 3, no. 4 (December 30, 2012): 99–110. Accessed December 20, 2025. https://emj.enu.kz/index.php/main/article/view/809.