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Guo, Mei; Li, Yuxia; Dou, Gang; Gong, Shuping . (2014). Low-temperature sintered ZnNb2O6–CaTiO3 ceramics with near-zero τf. Materials Chemistry and Physics, 147(3), 728–734. doi:10.1016/j.matchemphys.2014.06.013 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research