Қытайбеков, Е. “Dirichlet Problem for Three-Dimensional Hyperbolic-Parabolic Equations With Type and Order Extinction”. Journal of Mathematics, Mechanics and Computer Science 88, no. 1 (November 13, 2017): 28–34. Accessed November 28, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/326.