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Negi, D. S.; Loukya, B.; Datta, R. . (2015). Native defect induced charge and ferromagnetic spin ordering and coexisting electronic phases in CoO epitaxial thin film. Applied Physics Letters, 107(23), 232404–. doi:10.1063/1.4937009 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research