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Verdoes, J. C.; Sandmann, G.; Visser, H.; Diaz, M.; van Mossel, M.; van Ooyen, A. J. J. . (2003). Metabolic Engineering of the Carotenoid Biosynthetic Pathway in the Yeast Xanthophyllomyces dendrorhous (Phaffia rhodozyma). Applied and Environmental Microbiology, 69(7), 3728–3738. doi:10.1128/AEM.69.7.3728-3738.2003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research