Carvalho, F. de S.R. et al. 2001. Microscopic features of the umbilical cord in equine (Equus caballus ;¾; Linnaeus, 1758). Brazilian Journal of Veterinary Research and Animal Science. 38, 2 (Jan. 2001), 66–68. DOI:https://doi.org/10.1590/S1413-95962001000200004.