Nogueira, Guilherme de Paula, et al. “Serum Cortisol, Lactate and Creatinine Concentrations in Thoroughbred Fillies of Different Ages and States of Training”. Brazilian Journal of Veterinary Research and Animal Science, vol. 39, no. 1, Jan. 2002, pp. 54-57, https://doi.org/10.1590/S1413-95962002000100010.