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Siegenthaler, G; Saurat, J H; Ponec, M . (1990). Retinol and retinal metabolism. Relationship to the state of differentiation of cultured human keratinocytes. Biochemical Journal, 268(2), 371–378. doi:10.1042/bj2680371 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research