Artykova, Z., Rakhmonov, F. и Fayziyev, A. (2026) «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, (2), сс. 11–24. доступно на: https://journal.oshsu.kg/index.php/diffeq/article/view/4820 (просмотрено: 27 июль 2026).