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Jensen, P.B.; Jensen, J.; Riis, B.J.; Rødbro, P.; Strøm, V.; Christiansen, C.. (1987). Climacteric symptoms after oral and percutaneous hormone replacement therapy. , 9(3), 207–215. doi:10.1016/0378-5122(87)90003-X 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research