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Hanping Ding; Xingjian Xue; Xingqin Liu; Guangyao Meng. (2010). A novel layered perovskite cathode for proton conducting solid oxide fuel cells. , 195(3), 775–778. doi:10.1016/j.jpowsour.2009.08.022 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research