BilusyakN. and PtashnikB. I. (2001) “A Boundary-Value Problem for Weakly Nonlinear Hyperbolic Equations with Data on the Entire Boundary of a Domain”, Ukrains’kyi Matematychnyi Zhurnal, 53(2), pp. 244-249. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4240 (Accessed: 24November2024).