Molybai kyzy, A., A. Sarman, and A. Tankeyeva. “Boundary Value Problem for a System of Fredholm Integro-Differential Equations With Maxima”. Journal of Osh State University. Differential Equations, no. 1, Jan. 2026, pp. 15-23, https://journal.oshsu.kg/index.php/diffeq/article/view/3577.