Oleynikov, A.N., V.A. Pulavsky, and I.N. Chigirev. “Improving the Efficiency of Methods and Means for Suppressing Unauthorized Speech Recording”. Radiotekhnika 2, no. 209 (June 24, 2022): 156–161. Accessed April 20, 2024. http://rt.nure.ua/article/view/262518.