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Development of a Methodology for Transitioning from a Spectral Equation Relative to a Spatial Variable to a Differential Equation Relative to a Spectral Parameter in the Sturm-Liouville Problem for a One-Dimensional Periodic Two-Layer Photonic Crystal. radiophysics 2025, No. 42, 55-63. https://doi.org/10.26565/2311-0872-2025-42-06.