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Hyunsuk Shim; Shinya Oishi; Nobutaka Fujii. (2009). Chemokine receptor CXCR4 as a therapeutic target for neuroectodermal tumors. , 19(2), 123–134. doi:10.1016/j.semcancer.2008.11.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research