Ahmed, Ahmed, and Ali Abeed. “Preparation of Some Thiadiazol Compounds 1, 2, 3, 4 Derived from Coumarin Compounds”. Journal of Education and Science 17, no. 3 (June 1, 2005): 51–68. Accessed September 8, 2025. https://tanmiyat.uomosul.edu.iq/index.php/edusj/article/view/42308.