Emre, Birten, et al. “The Effects of Separate and Combined Use of PGF2α and GnRH Hormones and the Addition of Βeta-Carotene on Fertility Parameters in Dairy Cows With Ovarian Cysts”. Acta Scientiae Veterinariae, vol. 46, no. 1, Jan. 2018, p. 9, doi:10.22456/1679-9216.84205.