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Busch, D. C.; Atkins, J. A.; Bader, J. F.; Schafer, D. J.; Patterson, D. J.; Geary, T. W.; Smith, M. F. . (2008). Effect of ovulatory follicle size and expression of estrus on progesterone secretion in beef cows. Journal of Animal Science, 86(3), 553–563. doi:10.2527/jas.2007-0570 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research