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Cheng, Zhongjun; Lai, Hua; Du, Ying; Fu, Kewei; Hou, Rui; Zhang, Naiqing; Sun, Kening . (2013). Underwater Superoleophilic to Superoleophobic Wetting Control on the Nanostructured Copper Substrates. ACS Applied Materials & Interfaces, 5(21), 11363–11370. doi:10.1021/am403595z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research