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Eileen Tan; Magdalena Martinka; Nigel Ball; Jerry Shapiro. (2004). Primary cicatricial alopecias: clinicopathology of 112 cases. , 50(1), 0–32. doi:10.1016/j.jaad.2003.04.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research