Mancini, Dalva Assunção Portari, et al. “Anti-Human Influenza Protector Antibody Detected in Horses As a Zoonotic Viruses”. Brazilian Journal of Veterinary Research and Animal Science, vol. 41, no. 6, Nov. 2004, pp. 379-83, https://doi.org/10.1590/S1413-95962004000600004.