“Increase of Efficiency of Active Vibroacustics Protection of the Speech Information Systems”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 35 (October 2, 2007): 109–114. Accessed April 7, 2025. https://radap.kpi.ua/radiotechnique/article/view/324.