T. A. Barannyk, A. F. Barannyk, and I. I. Yuryk, “Exact solutions of the nonliear equation $u_{tt} = = a(t) uu_{xx} + b(t) u_x^2 + c(t) u $”, Ukr. Mat. Zhurn., vol. 69, no. 9, pp. 1180–1186, Sep. 2017, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/1768