A. B. Berzhanov and E. K. Kurmangaliev, “Solution of a countable system of quasilinear partial differential equations multiperiodic in a part of variables”, Ukr. Mat. Zhurn., vol. 61, no. 2, pp. 280–288, Feb. 2009, Accessed: Feb. 13, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3019