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

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