?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Van+Sau&rft.aulast=Nguyen&rft.aufirst=Van+Sau&rft.date=October+2011&rft.title=Protein+Type+Specific+Amino+Acid+Substitution+Models+for+Influenza+Viruses&rft.genre=proceeding