1. Evolutionary changes in influenza B are not primarily governed by antibody selection;Air,1990
2. Evolution of the H3 influenza virus hemagglutinin from human and nonhuman hosts;Bean;J. Virol.,1992
3. Molecular analysis of the surface protein genes of human (H5N1) influenza viruses;Bender,1998
4. Human influenza A (H5N1) virus related to a highly pathogenic avian influenza virus;Claas;Lancet,1998
5. Neuraminidase; enzyme and antigen;Colman,1989