Калиберда, М.Е., С.А. Погарский, and К.С. Дроздов. “Computation of Characteristics of Electronegative Metamaterial in Circular Waveguide Based on Multilayered Dielectric”. Radiotekhnika 3, no. 170 (September 29, 2012): 28–31. Accessed February 22, 2025. http://rt.nure.ua/article/view/174946.