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Phylogenies and divergence times of the haemagglutinin genes of classical swine and European avian-like SwIV. D Vijaykrishna et al. Nature 473 , 519-522 (2011) doi:10.1038/nature10004.
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Phylogenies and divergence times of the haemagglutinin genes of classical swine and European avian-like SwIV. D Vijaykrishna et al.Nature473, 519-522 (2011) doi:10.1038/nature10004