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Erick H. Turner; Jennifer M. Loftis; Aaron D. Blackwell. (2006). Serotonin a la carte: Supplementation with the serotonin precursor 5-hydroxytryptophan. , 109(3), 325–338. doi:10.1016/j.pharmthera.2005.06.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research