van Gils, J. A., Munster, V. J., Radersma, R., Liefhebber, D., Fouchier, R. A., & Klaassen, M. (2007). Hampered Foraging and Migratory Performance in Swans Infected with Low-Pathogenic Avian Influenza A Virus. Public Library of Science.

van Gils, Jan A., Vincent J. Munster, Reinder Radersma, Daan Liefhebber, Ron A.M Fouchier, ja Marcel Klaassen. Hampered Foraging and Migratory Performance in Swans Infected With Low-Pathogenic Avian Influenza A Virus. Public Library of Science, 2007.

van Gils, Jan A., et al. Hampered Foraging and Migratory Performance in Swans Infected With Low-Pathogenic Avian Influenza A Virus. Public Library of Science, 2007.