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H Abeygunawardena; C.M.B Dematawewa. (2004). Pre-pubertal and postpartum anestrus in tropical Zebu cattle. , 82-83(none), 0–387. doi:10.1016/j.anireprosci.2004.05.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research