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Staszewski, R.B.; Chih-Ming Hung; Barton, N.; Meng-Chang Lee; Leipold, D.. (2005). A digitally controlled oscillator in a 90 nm digital CMOS process for mobile phones. , 40(11), 0–2211. doi:10.1109/jssc.2005.857359 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research