Hassanzadeh, M., and M.H. Bozorgmeri Fard. “A Serological Study of Newcastle Disease in Pre- and Post-Vaccinated Village Chickens in North of Iran”. International Journal of Poultry Science, vol. 3, no. 10, Sept. 2004, pp. 658–661, https://doi.org/10.3923/ijps.2004.658.661.