Artykova, Z., F. Rakhmonov, и A. 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, вып. 2, июль 2026 г., сс. 11-24, https://journal.oshsu.kg/index.php/diffeq/article/view/4820.