Zh.A. Sartabanov, B.Zh. Omarova и A.Kerimbekov (2019) «RESEARCH OF MULTIPERIODIC SOLUTIONS OF PERTURBED LINEAR AUTONOMOUS SYSTEMS WITH DIFFERENTIATION OPERATOR ON THE VECTOR FIELD», Physico-mathematical series, (6), сс. 63–79. доступно на: https://journals.nauka-nanrk.kz/physics-mathematics/article/view/1694 (просмотрено: 4 декабрь 2024).