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Faghihnasiri, Mahdi; Izadifard, Morteza; Ghazi, Mohammad Ebrahim . (2017). A DFT Study of Mechanical Properties and Stability of Cubic Methyl Ammonium Lead Halide Perovskites (CH3NH3PbX3, X = I, Br, Cl). The Journal of Physical Chemistry C, (), acs.jpcc.7b07129–. doi:10.1021/acs.jpcc.7b07129 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research