van REETH, K., A. De VLEESCHAUWER, and C. S. KYRIAKIS. “Influenza in Birds, Pigs and Humans: How Strong Is the Species Barrier?”. Journal of the Hellenic Veterinary Medical Society 58, no. 3 (November 24, 2017): 208–219. Accessed April 20, 2024. https://ejournals.epublishing.ekt.gr/index.php/jhvms/article/view/14986.