Zh.А. Sartabanov, и G.M.Aitenova. «MULTIPERIODIC SOLUTIONS OF LINEAR SYSTEMS INTEGRO-DIFFERENTIAL EQUATIONS WITH C D -OPERATOR AND  -PERIOD OF HEREDITARY». Physico-Mathematical Series, вып. 6, декабрь 2019 г., сс. 106-22, https://journals.nauka-nanrk.kz/physics-mathematics/article/view/1697.