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Liu, Yimin; You, Jiabin; Hou, Qizhe . (2016). Entanglement dynamics of Nitrogen-vacancy centers spin ensembles coupled to a superconducting resonator. Scientific Reports, 6(), 21775–. doi:10.1038/srep21775 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research