Karabash, I. M., Olga M. Logachova, and Ievgen V. Verbytskyi. 2017. “Overdamped Modes and Optimization of Resonances in Layered Cavities”. Methods of Functional Analysis and Topology 23 (3): 252-60. https://zen.imath.kiev.ua/index.php/mfat/article/view/668.