Нагорнюк , О. А., and М. В. Бугайов. “Method for Estimation the Number of Frequency Elements Per Symbol for Signal With Fast Frequency Hopping and Frequency Manipulation”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 84, Mar. 2021, pp. 48-56, doi:10.20535/RADAP.2021.84.48-56.