BerzhanovA. B., & KurmangalievE. K. (2009). Solution of a countable system of quasilinear partial differential equations multiperiodic in a part of variables. Ukrains’kyi Matematychnyi Zhurnal, 61(2), 280-288. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3019