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Huang, Q.; Tan, Y.; Yin, P.; Ye, G.; Gao, P.; Lu, X.; Wang, H.; Xu, G. . (2013). Metabolic Characterization of Hepatocellular Carcinoma Using Nontargeted Tissue Metabolomics. Cancer Research, 73(16), 4992–5002. doi:10.1158/0008-5472.CAN-13-0308 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research