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Cannata, J.M.; Williams, J.A.; Qifa Zhou, ; Ritter, T.A.; Shung, K.K. . (2006). Development of a 35-MHz piezo-composite ultrasound array for medical imaging. IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 53(1), 224–236. doi:10.1109/TUFFC.2006.1588408 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research