SALAKHITDINOV, M. S.; HASANOV, A. The Dirichlet problem for the generalized bi-axially symmetric Helmholtz equation. Eurasian Mathematical Journal, [S. l.], v. 3, n. 4, p. 99–110, 2012. Disponível em: https://emj.enu.kz/index.php/main/article/view/809. Acesso em: 9 oct. 2025.