Bényei, Balázs, and Celso Walter Costa Barros. “Physiological Variations of Reproduction Parameters of Holstein-Friesian Cows Imported from Hungary to Northeastern Brazil”. Brazilian Journal of Veterinary Research and Animal Science, vol. 37, no. 3, Jan. 2000, pp. 216-20, https://doi.org/10.1590/S1413-95962000000300008.