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Hahn, Th.. (2006). [International Tables for Crystallography] International Tables for Crystallography Volume A (Space-group symmetry) || Printed symbols for crystallographic items. , 10.1107/97809553602060000100(Chapter 1.1), 2–3. doi:10.1107/97809553602060000500 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research