Калиберда, М.Е., Л.Н. Литвиненко, and С.А. Погарский. “Operator Method in Diffraction by Semi-Infinite Graphene Grating”. Radiotekhnika 1, no. 196 (March 31, 2019): 112–116. Accessed May 8, 2024. http://rt.nure.ua/article/view/174704.