Ananth, R.; Kirubaharan, J. J.; Priyadarshini, M.; Albert, A. Isolation of Newcastle Disease Viruses of High Virulence in Unvaccinated Healthy Village Chickens in South India . Int. J. Poult. Sci. 2008, 7 (4), 368–373. https://doi.org/10.3923/ijps.2008.368.373.