Khajiev I.O, Mamatqulova M.Sh, and Komiljonova G.A. 2023. “Conditional Correctness of the Initial-Boundary Value Problem for The System of Second Order Mixed Type Equations”. Eurasian Journal of Physics,Chemistry and Mathematics 17 (April):47-57. https://geniusjournals.org/index.php/ejpcm/article/view/3984.