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Haiyan Cheng; Yuanhang Ren; Shuxia Liu; Linhua Xie. (2008). Syntheses, Structures and Spectroscopic Characterization of Extended Waugh-Type Polyoxometalates with Metal Ions as Linkers. , 634(5), 977–980. doi:10.1002/zaac.200700365 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research