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Liu, Yuxiu; Murphy, Michael W.; Baker, Daniel R.; Gu, Wenbin; Ji, Chunxin; Jorne, Jacob; Gasteiger, Hubert A.. (2009). Proton Conduction and Oxygen Reduction Kinetics in PEM Fuel Cell Cathodes: Effects of Ionomer-to-Carbon Ratio and Relative Humidity. , 156(8), 0–0. doi:10.1149/1.3143965 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research