Pane, R., Ritonga, A. A., Bangun, B., Purnama, I., & Raharjo, S. D. (2020). Expert System of Diagnosing Chikungunya Disease by Certainty Factor Method . Jurnal Mantik, 4(3), 2035-2040. https://doi.org/10.35335/mantik.Vol4.2020.1063.pp2035-2040