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