C. de A. B. Sobrinho, L. K. Hatamoto-Zervoudakis, V. H. Barnabe, M. Nichi, and C. A. de Oliveira, “Evaluation of work stress effects on Rottweilers male dog´s fertility”, Braz. J. Vet. Res. Anim. Sci., vol. 46, no. 4, pp. 280-287, Aug. 2009.