Y. Al-Khalil, B., T. Y. Ahmad, and L. A. Mustafa. “Some Biochemical Studies on Serum of Duodenal Ulcer Patients Infected With Helicobacter Pylori in Ninevah Governorate”. Rafidain Journal of Science, vol. 16, no. 8, June 2005, pp. 35-44, doi:10.33899/rjs.2005.42289.