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M. Goldstein; M.R. McKereghan; E. Lauber. (1963). The involvement of sulfhydryl sites in dopamine-β-hydroxylase activity. , 77(none), 161–164. doi:10.1016/0006-3002(63)90486-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research