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Neukirch, Michael; Tragl, Sonja; Meyer, H.-Jürgen . (2006). Syntheses and Structural Properties of Rare Earth Carbodiimides. Inorganic Chemistry, 45(20), 8188–8193. doi:10.1021/ic0608952 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research