Lima, S. B., A. Wischral, F. Ferreira, and I. T. do N. Verreschi. “HCG Induced Steroidogenic Response in Mangalarga Young Stallions: Plasma Testosterone and Estrone Sulphate”. Brazilian Journal of Veterinary Research and Animal Science, vol. 37, no. 1, Jan. 2000, pp. 52-55, doi:10.1590/S1413-95962000000100008.