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E. Cuevas; M. Camacho; M. Alvarado; R. Hudson; P. Pacheco. (2006). Participation of estradiol and progesterone in the retrograde labeling of pubococcygeus motoneurons of the female rat. , 140(4), 0–1442. doi:10.1016/j.neuroscience.2006.03.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research