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Calvo, B.; Celma, S.; Alegre, J. P.; Sanz, M. T.; de Armas Sosa, Valentín; Eshraghian, Kamran; Tobajas, Félix B. . (2007). SPIE Proceedings [SPIE Microtechnologies for the New Millennium - Maspalomas, Gran Canaria, Spain (Wednesday 2 May 2007)] VLSI Circuits and Systems III - <title>A low-voltage fully-balanced CMFF transconductor with improved linearity</title>. , 6590(), 65901B–65901B-9. doi:10.1117/12.722000 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research