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S.P.R. Czitrom; R. Godoy; E. Prado; P. Pérez; R. Peralta-Fabi. (2000). Hydrodynamics of an oscillating water column seawater pump: Part I: theoretical aspects. , 27(11), 1181–1198. doi:10.1016/s0029-8018(99)00040-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research