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Grabner, M.; Kvicera, V. . (2005). [IEEE 2005 Asia-Pacific Microwave - Suzhou, China (04-07 Dec. 2005)] 2005 Asia-Pacific Microwave Conference Proceedings - Statistics of Lower Atmosphere Refractivity in Czechia. , 4(), 1–4. doi:10.1109/apmc.2005.1606923 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research