“PROBLEMS WITH INTEGRAL AND BITSADZE-SAMARSKY CONDITION FOR A SECOND-ORDER PARABOLIC-HYPERBOLIC EQUATION WITH A SINGULAR COEFFICIENT ” (2023) Scientific journal of the Fergana State University, 28(2), p. 43. Available at: https://journal.fdu.uz/index.php/sjfsu/article/view/1940 (Accessed: 25 December 2025).