Doustar, Y. et al. 2017. An Experimental Study on Apoptosis in Lymphoid Tissues of SPF Chicken after Avian Influenza Serotypes H9N2 Infection. Asian Pacific Journal of Cancer Biology. 2, 4 (Dec. 2017), 81–84. DOI:https://doi.org/10.31557/apjcb.2017.2.4.81-84.