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Niwa, Masayuki; Mibu, Hiroyuki; Nozaki, Masakatsu; Tsurumi, Kaito; Fujimura, Hajime . (1991). Dopaminergic Unique Affinity of Tetrahydroberberine and <i>l</i>-Tetrahydroberberine-<i>d</i>-Camphor Sulfonate. Pharmacology, 43(6), 329–336. doi:10.1159/000138863 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research