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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.