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Li Liu; Willi Halfter; Paul G. Layer. (1986). Inhibition of cell proliferation by cytosin-arabinoside and its interference with spatial and temporal differentiation patterns in the chick retina. , 244(3), 501–513. doi:10.1007/bf00212527 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research