Рассохина, Ю., and В. Крыжановский. “The Method of Discontinuities Analysis in Microstrip-Slotline Structures. Part 1: Analysis of Step Discontinuity in Microstrip Line by Transverse Resonance Technique”. Radiotekhnika, vol. 4, no. 187, Dec. 2016, pp. 91-99, http://rt.nure.ua/article/view/210835.