Costa, Fernando Santos, et al. “Biometry of Head and Cranial Cavity of Wooless Mongrel Sheep (Ovis Aries LINNAEUS, 1758) in Petrolina Pernambuco, Brazil”. Brazilian Journal of Veterinary Research and Animal Science, vol. 48, no. 4, Aug. 2011, pp. 307-14, https://doi.org/10.11606/S1413-95962011000400005.