Tapparo , Ane F., et al. “Apoptosis Detection in Embryonic Chicken Lymphoid Tissues Infected With Attenuated Very Virulent Infectious Bursal Disease Virus (vvIBDV)”. Brazilian Journal of Veterinary Pathology, vol. 2, no. 2, Nov. 2009, pp. 75-79, https://doi.org/10.24070/bjvp.1983-0246.002013.