Sartabanov Z, Omarova B, Kerimbekov A. RESEARCH OF MULTIPERIODIC SOLUTIONS OF PERTURBED LINEAR AUTONOMOUS SYSTEMS WITH DIFFERENTIATION OPERATOR ON THE VECTOR FIELD. PMS [Интернет]. 4 февраль 2020 г. [цитируется по 11 декабрь 2024 г.];(1):5-13. доступно на: http://91834.libg.asia/physics-mathematics/article/view/386