Лющенко, М., Л. Лерман, and Я. Криворучко. “Electromagnetic Waves Interaction With a Multi-Layered Spherical Lens”. Visnyk NTUU KPI Seriia - Radiotekhnika Radioaparatobuduvannia, no. 34, June 2007, pp. 54-58, doi:10.20535/RADAP.2007.34.54-58.