Omarova, B. and Sartabanov, Z. (2021) “On Multiperiodic Solutions of Perturbed Nonlinear Autonomous Systems with the Differentiation Operator on a Vector Field”, Eurasian Mathematical Journal, 12(1). Available at: https://emj.enu.kz/index.php/main/article/view/206 (Accessed: 21 November 2025).