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Mier Odiozola, José Manuel; Fibla Alfara Molins L, Juan José; Molins López-Rodó, Laureano . (2014). Neumotórax catamenial: un síndrome heterogéneo. Cirugía Española, 92(5), 366–368. doi:10.1016/j.ciresp.2012.04.021 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research