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Morteza Mousazadeh; Khayrollah Hadidi; Abdollah Khoei. (2008). A novel open-loop high-speed CMOS sample-and-hold. , 62(8), 588–596. doi:10.1016/j.aeue.2007.08.003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research