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Leiner, Claude; Nemitz, Wolfgang; Schweitzer, Susanne; Wenzl, Franz P.; Hartmann, Paul; Hohenester, Ulrich; Sommer, Christian . (2014). Multiple interfacing between classical ray-tracing and wave-optical simulation approaches: a study on applicability and accuracy. Optics Express, 22(13), 16048–. doi:10.1364/oe.22.016048 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research