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H. Quadbeck; E. Lehmann; J. Tegeler. (1984). Comparison of the Antidepressant Action of Tryptophan, Tryptophan/5-Hydroxytryptophan Combination and Nomifensine. , (), –. doi:10.1159/000118063 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research