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Larson, J. P.; Dapino, M. J. . (2012). Reliable, high-frequency miniature valves for smart material electrohydraulic actuators. Journal of Intelligent Material Systems and Structures, 23(7), 805–813. doi:10.1177/1045389X12438628 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research