Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleSelection pressure on Haemagglutinin genes of H9N2 influenza viruses from different hosts.AuthorsShi, Wei-feng; Dun, Ai-she; Zhang, Zhong; Zhang, Yan-zhou; Yu, Guang-fu; Zhuang, Dong-ming; Zhu, Chao-dongPublicationVirologica Sinica (16740769), 2009, Vol 24, Issue 1, p65ISSN1674-0769Publication typeArticleDOI10.1007/s12250-009-2988-5