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Kim, Seong-Jin; Han, Sang-Wook; Kang, Byongmin; Lee, Keechang; Kim, James D. K.; Kim, Chang-Yeong . (2010). A Three-Dimensional Time-of-Flight CMOS Image Sensor With Pinned-Photodiode Pixel Structure. IEEE Electron Device Letters, (), 5560722–148. doi:10.1109/LED.2010.2066254 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research