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Czeczuga, B.. (1981). Carotenoids in fish—XXX. Rhodoxanthin in Ctenopharyngodon idella Val. (cyprinidae). Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 69(4), 885–887. doi:10.1016/0305-0491(81)90400-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research