5Ballagi-Pordany A,Wehmann E Herczeg J,et al.Identification and grouping of virus strains by restriction site analysis of a region from the F gene[J].Arch Virol,1996,141:243-261.
6Kwon H J,Cho s H,Ahn Y J,et al.Molecular epidemiology of Newcastle disease in the Republic of Korea[J].Vet Microbiol,2003,5:39-48.