Zh.A. Sartabanov, B.Zh. Omarova, A.Kerimbekov. RESEARCH OF MULTIPERIODIC SOLUTIONS OF PERTURBED LINEAR AUTONOMOUS SYSTEMS WITH DIFFERENTIATION OPERATOR ON THE VECTOR FIELD. PMS [Интернет]. 12 декабрь 2019 г. [цитируется по 14 март 2025 г.];(6):63-79. доступно на: http://91834.libg.asia/physics-mathematics/article/view/1694