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Hong, Seung-Hye; Nam, Hyun-Koo; Kim, Kyoung-Rok; Kim, Seon-Won; Oh, Deok-Kun . (2014). Molecular characterization of an aldo-keto reductase from Marivirga tractuosa that converts retinal to retinol. Journal of Biotechnology, 169(), 23–33. doi:10.1016/j.jbiotec.2013.11.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research