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Isabelle Veissier; D. Lamy; P. Le Neindre. (1990). Social behaviour in domestic beef cattle when yearling calves are left with the cows for the next calving. , 27(3), 0–200. doi:10.1016/0168-1591(90)90056-j 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research