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Guillaume Morin; Claudia Lalancette; Robert Sullivan; Pierre Leclerc. (2005). Identification of the bull sperm p80 protein as a PH-20 ortholog and its modification during the epididymal transit. , 71(4), 523–534. doi:10.1002/mrd.20308 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research