Bilusyak N, Ptashnik BI. A Boundary-Value Problem for Weakly Nonlinear Hyperbolic Equations with Data on the Entire Boundary of a Domain. Ukr. Mat. Zhurn. [Internet]. 2001Feb.25 [cited 2024Nov.24];53(2):244-9. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4240