Analysis and methodology of determining the norm of eigenfunctions as a limit transition in the scalar product in the spectral Stourm-Louvile problem for a photonic one-dimensional crystal. (2023). Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”, 39, 18-26. https://doi.org/10.26565/2311-0872-2023-39-02