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Shucha Zhang; Lingyan Liu; Debora Steffen; Tao Ye; Daniel Raftery. (2012). Metabolic profiling of gender: Headspace-SPME/GC–MS and1H NMR analysis of urine. , 8(2), 323–334. doi:10.1007/s11306-011-0315-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research