Шишкин, А. В. “Statistical Digital Watermarks of Audio Signals”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia0, no. 62 (September 30, 2015): 20-30. Accessed May 16, 2021. http://radap.kpi.ua/radiotechnique/article/view/1071.