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de Vries, M.; Bokkers, E.A.M.; van Schaik, G.; Engel, B.; Dijkstra, T.; de Boer, I.J.M. . (2014). Exploring the value of routinely collected herd data for estimating dairy cattle welfare. Journal of Dairy Science, 97(2), 715–730. doi:10.3168/jds.2013-6585 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research