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Dale E. Blum, Michael M. Neff and Elizabeth Van Volkenburgh. (1994). Light-Stimulated Cotyledon Expansion in the blu3 and hy4 Mutants of Arabidopsis thaliana. Plant Physiology, 105(4), 1433–1436. doi:10.2307/4275999 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research