Tursi, A., and C. Inchingolo. “Long-Lasting Unspecic Intestinal Inammation in Ankylosing Spondylitis Evolving into Crohn’s Disease”. Journal of Gastrointestinal and Liver Diseases, Vol. 22, no. 4, Dec. 2013, pp. 471-4, https://jgld.ro/jgld/index.php/jgld/article/view/2013.4.192.