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T. Arlt; T. Armbruster; R. Miletich; P. Ulmer; T. Peters. (1998). High pressure single-crystal synthesis, structure and compressibility of the garnet Mn2+3Mn3+2[SiO4]3. , 26(2), 100–106. doi:10.1007/s002690050165 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research