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Gostner, Johanna M.; Becker, Kathrin; Strasser, Barbara; Fuchs, Dietmar . (2016). Smoking reduces tryptophan breakdown. Neurology, Psychiatry and Brain Research, 22(1), 11–. doi:10.1016/j.npbr.2015.12.023 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research