Ahmad, A. S. M., and H. A. E. Ahmed. “Evaluation of Salivary C-Reactive Protein in Smokers With Periodontitis in Khartoum State”. International Journal of Complementary and Internal Medicine, vol. 6, no. 1, June 2024, pp. 254-8, https://ijcimjournal.com/index.php/1/article/view/58.