Effects of diethylstilbestrol administration on sperm penetration into the inner perivitelline layer of Japanese quail, Coturnix japonica Win, M.M.; Tatemoto, H.; Ashizawa, K.; Nakada, T. Journal of Poultry Science 43(1): 67-74 2006 https://eurekamag.com/research/004/513/004513297.php