Yousif Hussein, Ahmed El Rayah, Yousif Hussein Elmansoury, Mohammed Osman Hussien, Mohammed Idress Taha, Hoyam Awad Mahgoub, and Abdelrahim Mohamed El Hussein. 2015. “Oxytetracycline Residues in Sheep Meat in Khartoum State, Sudan”. Journal of Advanced Veterinary and Animal Research 2 (3):321-25. https://banglajol.info/index.php/JAVAR/article/view/24866.