M. Babiker, A. Tawfeig, I. Yahia, and K. Noura, “Mortality and Diseases Status in Layer Chicken Flocks Reared in Traditional Farms in Khartoum-Sudan”, Int. J. Poult. Sci., vol. 8, no. 3, pp. 264–269, Feb. 2009, doi: 10.3923/ijps.2009.264.269.