EleevV. A., & KumykovaS. K. (2000). On some boundary-value problems with a shift on characteristics for a mixed equation of hyperbolic-parabolic type. Ukrains’kyi Matematychnyi Zhurnal, 52(5), 707-716. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4464