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Munster, Vincent J., Anders Wallensten, Chantal Baas, Guus F. Rimmelzwaan, Martin Schutten, Björn Olsen, Albert D.M.E Osterhaus, e Ron A.M Fouchier. Mallards and Highly Pathogenic Avian Influenza Ancestral Viruses, Northern Europe. Centers for Disease Control and Prevention, 2005.

Munster, Vincent J., et al. Mallards and Highly Pathogenic Avian Influenza Ancestral Viruses, Northern Europe. Centers for Disease Control and Prevention, 2005.