Yousif Hussein, A.E.R., Elmansoury, Y.H., Hussien, M.O., Taha, M.I., Mahgoub, H.A. and El Hussein, A.M. 2015. Oxytetracycline residues in Sheep meat in Khartoum State, Sudan. Journal of Advanced Veterinary and Animal Research. 2, 3 (Sep. 2015), 321–325.