PROBLEMS WITH INTEGRAL AND BITSADZE-SAMARSKY CONDITION FOR A SECOND-ORDER PARABOLIC-HYPERBOLIC EQUATION WITH A SINGULAR COEFFICIENT . Scientific journal of the Fergana State University, [S. l.], v. 28, n. 2, p. 43, 2023. Disponível em: https://journal.fdu.uz/index.php/sjfsu/article/view/1940. Acesso em: 25 dec. 2025.