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V. Kahlenberg; W. Wertl; A. Kremenovic; P. Schuster; H. Schottenberger. (2008). Structural Investigations and Thermal Behavior of (NH4)[Cr(C2O4)2]·2H2O. , 634(5), 921–926. doi:10.1002/zaac.200700523 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research