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Wei-Ran, Wang; Da-Peng, Xu; Wen-Hui, Su . (2005). Raman Shift of RMnO <sub/>3</sub> ( <i>R</i> = La, Pr, Nd, Sm) Manganites. Chinese Physics Letters, 22(3), 705–707. doi:10.1088/0256-307x/22/3/051 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research