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Chan, George H.; Deng, Bin; Bertoni, Mariana; Ireland, John R.; Hersam, Mark C.; Mason, Thomas O.; Van Duyne, Richard P.; Ibers, James A. . (2006). Syntheses, Structures, Physical Properties, and Theoretical Studies of CeM <i> <sub/>x</sub></i> OS (M = Cu, Ag; <i>x</i> ≈ 0.8) and CeAgOS. Inorganic Chemistry, 45(20), 8264–8272. doi:10.1021/ic061041k 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research