Dubrovka, F. F., and S. I. Piltyay. “Eigenmodes Analysis of Sectoral Coaxial Ridged Waveguides by Transverse Field-Matching Technique. Part 2. Results”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 55, Dec. 2013, pp. 13-23, doi:10.20535/RADAP.2013.55.13-23.