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Q. Zhang; G.H. Rao; Y.G. Xiao; H.Z. Dong; G.Y. Liu; Y. Zhang; J.K. Liang. (2006). Crystal structure, magnetic and electrical-transport properties of rare-earth-doped Sr2FeMoO6. , 381(1-2), 233–238. doi:10.1016/j.physb.2006.01.467 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research