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Xiang Liu; Yu-Ming Wang. (2007). Revisiting B+→X(3872)+K+in pQCD assigning to X(3872) 23P1charmonium. , 49(3), 643–650. doi:10.1140/epjc/s10052-006-0135-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research