KazankoО., PenkinaО., Butenko, V., & Holovko, O. (2024). Research and determination of the 1st and 2nd derivatives of the component terms of the dispersion equation for a flat two-layer one-dimensional periodic photonic crystal. Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”, (40), 29-41. https://doi.org/10.26565/2311-0872-2024-40-03