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LIU, XIAOYU; NIE, HAILIANG; WANG, LI; HUANG, RUDAN . (2013). Three inorganic–organic hybrid compounds based on Keggin polyoxometalate and transition metal complexes: crystal structures and electrochemical properties. Journal of Coordination Chemistry, 66(3), 444–452. doi:10.1080/00958972.2012.760040 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research