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Tseng, Ching-Fang; Chen, Chao-Chen; Lin, Chen-Wei . (2014). Effect of sintering aid on microwave dielectric behaviors of Ni0.5Ti0.5NbO4 ceramics for LTCC applications. Materials Chemistry and Physics, 147(3), 535–539. doi:10.1016/j.matchemphys.2014.05.027 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research