“Application of Height Platforms and Technology of OFDM in the Telecommunication Systems of 4G”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 34 (June 6, 2007): 86–91. Accessed April 18, 2025. https://radap.kpi.ua/radiotechnique/article/view/378.