C. M. R. Monteiro, R. Carvalhal, and S. H. V. Perri, “Morphological analysis of ovaries of Nelore bovine fetuses (Bos primigenius indicus) at various gestation stages”, Braz. J. Vet. Res. Anim. Sci., vol. 40, no. 6, pp. 409–415, Jan. 2003, doi: 10.1590/S1413-95962003000600004.