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Yamanaka, J; Metcalfe, S A; Hutson, J M; Mendelsohn, F A . (1993). Testicular descent. II. Ontogeny and response to denervation of calcitonin gene-related peptide receptors in neonatal rat gubernaculum.. Endocrinology, 132(1), 280–284. doi:10.1210/endo.132.1.8380378 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research