Cheng-Yao Yang, Poa-Chun Chang, Jyh-Min Hwang, Happy K. Shieh, Nucleotide Sequence and Phylogenetic Analysis of Newcastle Disease Virus Isolates from Recent Outbreaks in Taiwan, Avian Diseases, Vol. 41, No. 2 (Apr. - Jun., 1997), pp. 365-373
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Yang et al. (1997) studied this question.