Левандовський, В.Г. 2009. “Method for Engineering of Refraction Index Profile of Circular Crosssection Waveguide”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 39 (October):98-103. https://doi.org/10.20535/RADAP.2009.39.98-103.