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Zurcher, E.; Liu, J.; di Donato, M.; Geisler, M.; Muller, B. . (2016). Plant development regulated by cytokinin sinks. Science, 353(6303), 1027–1030. doi:10.1126/science.aaf7254 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research