ШАПОВАЛОВ, Ю. І.; МАНДЗІЙ, Б. А.; БАЧИК, Д. Р. About the accuracy of assessment of stability of linear periodically time-variable circuits by the frequency symbolic method. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, [S. l.], n. 61, p. 13-22, 2015. DOI: 10.20535/RADAP.2015.61.13-22. Disponível em: http://radap.kpi.ua/radiotechnique/article/view/1068. Acesso em: 28 nov. 2021.