Artykova, Zhyldyz, Farhod Rakhmonov, и Aziz Fayziyev. «Periodic Solutions of a System of Nonlinear Integro-Differential Equations With a Product of Two Nonlinear Functions and Maxima». Journal of Osh State University. Differential Equations, no. 2 (июль 1, 2026): 11–24. просмотрено июль 27, 2026. https://journal.oshsu.kg/index.php/diffeq/article/view/4820.