Berzhanov, A. B., and E. K. Kurmangaliev. “Solution of a Countable System of Quasilinear Partial Differential Equations Multiperiodic in a Part of Variables”. Ukrains’kyi Matematychnyi Zhurnal 61, no. 2 (February 25, 2009): 280–288. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/3019.