Zh.N. Tasmambetov, N. Rajabov, & Zh.K.Ubayeva. (2019). THE COORDINATED SOLUTION OF TWO DIFFERENTIAL EQUATIONS IN PRIVATE DERIVATIVES OF THE THIRD ORDER. Известия НАН РК. Серия физико-математическая, (4), 83–91. извлечено от http://189185.vm7pq.group/physics-mathematics/article/view/1679