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Zhang, Guikai; Xiang, Xin; Yang, Feilong; Peng, Xuexing; Tang, Tao; Shi, Yan; Wang, Xiaolin . (2016). Helium stability and its interaction with H in α-Al <sub/>2</sub> O <sub/>3</sub> : a first-principles study. Phys. Chem. Chem. Phys., 18(3), 1649–1656. doi:10.1039/C5CP06496A 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research