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Zywietz, A.; Furthmüller, J.; Bechstedt, F.. (1999). Vacancies in SiC: Influence of Jahn-Teller distortions, spin effects, and crystal structure. , 59(23), 15166–15180. doi:10.1103/physrevb.59.15166 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research