Tokibetov Ж, Bashar Н, Pirmanova А. THE CAUCHY-DIRICHLET PROBLEM FOR A SYSTEM OF FIRST-ORDER EQUATIONS. Phys-Math [Internet]. 2020Dec.29 [cited 2025Dec.15];72(4):68-72. Available from: https://bulletin-phmath.kaznpu.kz/index.php/ped/article/view/80