8WEBSTER R G,BEAN W J,GORMAN T,et al. Evolution and ecology of influenza A viruses[J]. Microbiol Rev,1992,56:152 - 179.
9XU X,SUBBARAO K, COX N J,et al. Genetic characterization of the pathogenic influenza A/Goose/Guang-dong/l/96( H5N1 ) virus :similarity of its hemagglutinin gene to those of H5N1 viruses from the 1997 outbresks in Hong Kong[ J ]. Virology, 1999,261 ( 1 ) : 15 - 19.
