Maulia, A. ., Purwadi, P., & Kusuma, B. A. . (2026). Rule-Based Expert System for Personalized GERD Food Recommendations Using Forward Chaining and Certainty Factor in Indonesia. Jurnal Teknik Informatika (Jutif), 7(2), 1468–1482. https://doi.org/10.52436/1.jutif.2026.7.2.5477