Barnabé, V.H. et al. 1995. Testosterone concentration in blood serum of buffalo bulls during 24 hours in winter and summer seasons. Brazilian Journal of Veterinary Research and Animal Science. 32, 3 (Sep. 1995), 191–193. DOI:https://doi.org/10.11606/issn.1678-4456.bjvras.1994.52110.