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Sivčev, Satja; Coleman, Joseph; Omerdić, Edin; Dooly, Gerard; Toal, Daniel . (2018). Underwater manipulators: A review. Ocean Engineering, 163(), 431–450. doi:10.1016/j.oceaneng.2018.06.018 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research