“Improvement of Mathematical Models With Time-Shift of Two- and Tri-Fragment Signals With Non-Linear Frequency Modulation”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 93, Sept. 2023, pp. 22-30, https://doi.org/10.20535/RADAP.2023.93.22-30.