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https://www.kth.se/en/om/upptack/kalender/disputationer/ray-tracing-and-physical-optics-for-geodesic-and-grin-lens-antennas-1.1420801 Ray Tracing and Physical Optics for Geodesic and GRIN Lens Antennas | KTH ray tracing physical optics grin lens https://www.muni.cz/vyzkum/publikace/2374666 GRIN Lens Design by Defining Phase Function and Using Optical Path Rescaling | Masarykova...