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A. Martinelli; A. Palenzona; C. Ferdeghini; M. Putti; H. Emerich. (2009). Tetragonal to orthorhombic phase transition in SmFeAsO: A synchrotron powder diffraction investigation. , 477(1-2), 0–. doi:10.1016/j.jallcom.2008.10.153 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research