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Soma Das; T.K. Dey. (2007). Magnetic entropy change in polycrystalline La1−xKxMnO3 perovskites. , 440(1-2), 0–35. doi:10.1016/j.jallcom.2006.09.051 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research