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Gorman, O T., W J. Bean, Y. Kawaoka, I. Donatelli, Y J. Guo, and R G. Webster. Evolution of Influenza A Virus Nucleoprotein Genes: Implications for the Origins of H1N1 Human and Classical Swine Viruses. 1991.

Gorman, O T., et al. Evolution of Influenza A Virus Nucleoprotein Genes: Implications for the Origins of H1N1 Human and Classical Swine Viruses. 1991.