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CIOFI, C.; CANNATÀ', G.; SCANDURRA, G.; MERLINO, R. . (2007). A VERY LOW NOISE, HIGH STABILITY, VOLTAGE REFERENCE FOR HIGH SENSITIVITY NOISE MEASUREMENTS. Fluctuation and Noise Letters, 7(3), L231–L238. doi:10.1142/s021947750700388x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research