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V. Pavlyuk; I. Oshchapovsky; B. Marciniak. (2009). Crystal structure of the TbZnSn2 and TbZnSn ternary compounds. , 477(1-2), 0–148. doi:10.1016/j.jallcom.2008.10.014 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research