Penha, M.D.L. et al. 1996. Influence of low environmental temperature on the phagocytic activity of bullfrog (Rana catesbeiana) thrombocytes. Brazilian Journal of Veterinary Research and Animal Science. 33, 1 (Mar. 1996), 15–18. DOI:https://doi.org/10.11606/issn.2318-3659.v33i1p15-18.