M. Babiker, I. Yahia, K. Nora, and E. Tawfeeg, “Investigations on Nine Flocks Infected with Infectious Bursal Disease Virus (IBDV) in Khartoum State (Sudan) ”, Int. J. Poult. Sci., vol. 7, no. 3, pp. 285–288, Feb. 2008, doi: 10.3923/ijps.2008.285.288.