Elfadl, Ahmed K., Kathrin Jäger, Heinz A. Schoon, and Ahmed A. Gameel. 2016. “Frequency, Pathology and Electron Microscopy of Dromedary Camel Viral Fibro-Papilloma in Sudan”. Brazilian Journal of Veterinary Pathology 9 (2): 39-46. https://bjvp.org.br/bjvp/article/view/213.