Barannyk TA, Barannyk AF, Yuryk II. Exact solutions of the nonliear equation $u_{tt} = = a(t) uu_{xx} + b(t) u_x^2 + c(t) u $. Ukr. Mat. Zhurn. [Internet]. 2017Sep.25 [cited 2024Apr.20];69(9):1180-6. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/1768