Lavrenyuk, S. P., & Protsakh, N. P. (2006). Mixed problem for a nonlinear ultraparabolic equation that generalizes the diffusion equation with inertia. Ukrains’kyi Matematychnyi Zhurnal, 58(9), 1192–1210. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3522