Pogarsky, S., and D. Mayboroda. “Wideband Bandstop Filter Based on Quasi-Fractal Structure”. Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”, no. 38, June 2023, pp. 23-29, doi:10.26565/2311-0872-2023-38-03.