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Baschirotto, A.; Alini, R.; Castello, R.; Montecchi, F. . (1993). [IEEE 1993 IEEE International Symposium on Circuits and Systems - Chicago, IL, USA (3-6 May 1993)] 1993 IEEE International Symposium on Circuits and Systems - High-speed BiCMOS operational amplifier for switched-capacitor circuits. , (), 998–1001. doi:10.1109/iscas.1993.393892 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research