Pane, Rahmadani, Ali Akbar Ritonga, Budianto Bangun, Iwan Purnama, and Sutrisno Dwi Raharjo. “Expert System of Diagnosing Chikungunya Disease by Certainty Factor Method ”. Jurnal Mantik 4, no. 3 (November 1, 2020): 2035-2040. Accessed April 22, 2026. http://www.ejournal.iocscience.org/index.php/mantik/article/view/1063.