G. S. REDDY and V. A. SRINIVASAN, “Evaluation of BHK21 cell-line adapted Newcastle disease vaccine”, Indian J of Anim Sci, vol. 67, no. 5, Oct. 2013, Accessed: Oct. 24, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/34366