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Leu, Y.-W.. (2004). Loss of Estrogen Receptor Signaling Triggers Epigenetic Silencing of Downstream Targets in Breast Cancer. Cancer Research, 64(22), 8184–8192. doi:10.1158/0008-5472.can-04-2045 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research