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Zlotea, Claudia; Isnard, Olivier . (2002). Neutron diffraction and magnetic investigations of the TbCo <sub/>4</sub> M compounds (M   Al and Ga). Journal of Physics: Condensed Matter, 14(43), 10211–10220. doi:10.1088/0953-8984/14/43/318 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research