Видалко, О.Є., and С.Є. Мартинюк. 2011. “The Investigation of Dual Frequency Microstrip Antenna”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 44 (March):82-88. https://doi.org/10.20535/RADAP.2011.44.82-88.