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Nelson, C. D.; Powell, J. L.; Price, D. M.; Hersom, M. J.; Yelich, J. V.; Drewnoski, M. E.; Bird, S. L.; Bridges, G. Allen . (2016). Assessment of serum 25-hydroxyvitamin D concentrations of beef cows and calves across seasons and geographical locations. Journal of Animal Science, 94(9), 3958–. doi:10.2527/jas.2016-0611 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research