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T. Hattori; T. Matsuda; T. Tsuchiya; T. Nagai; T. Yamanaka. (1999). Clinopyroxene-perovskite phase transition of FeGeO3under high pressure and room temperature. , 26(3), 212–216. doi:10.1007/s002690050179 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research