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Chen, Xiaozhao; Wang, Bin; Li, Xiaoya; Zeng, Xiaoqiang; Yu, Shaolan; Lü, Xiaofu . (2009). in the relativistic quark model. Physical Review D, 79(11), 114006–. doi:10.1103/PhysRevD.79.114006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research