1. Influenza virus neuraminidase and neuraminidase inhibition test procedures;Aymard-Henry;Bull. WHO,1973
2. Sequence Variation at the 3′ Ends of Neuraminidase Gene Segments within and among the Different NA Subtypes;Blok,1981
3. Comparative nucelotide sequences at the 3′ end of the neuraminidase gene from 11 influenza type A viruses;Blok;Virology,1980
4. Sequence variations observed in the neuraminidases of several strains of influenza virus;Blok,1980
5. The N terminus of influenza type A neuraminidse is not processed and serves to anchor neuraminidase in the viral membrane;Blok,1982