Круглик, О. С., О. Калюжний, and В. Ю. Семенов. “Efficient QPSK Signal Demodulation in Channels With Unfavorable Conditions of Radio Reception”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 78, Sept. 2019, pp. 13-18, https://radap.kpi.ua/radiotechnique/article/view/1588.