Maikotov, M. N. “The Dirichlet Problem for Multidimensional Hyperbola-Parabolic Equations With Degeneracy of Type and Order”. Journal of Mathematics, Mechanics and Computer Science 98, no. 2 (August 29, 2018): 23–32. Accessed July 3, 2024. https://bm.kaznu.kz/index.php/kaznu/article/view/405.