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Ryan, I P; Schriock, E D; Taylor, R N . (1994). Isolation, characterization, and comparison of human endometrial and endometriosis cells in vitro.. The Journal of Clinical Endocrinology & Metabolism, 78(3), 642–649. doi:10.1210/jcem.78.3.8126136 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research