RIZKYTA AD, Ulum MB, Adline Twince Tobing F. Fuzzy Expert System for Early Heart Disease Diagnosis Using Mamdani Method in Web-Based System. Ultimatics [Internet]. 2026 Jun. 30 [cited 2026 Jul. 5];18(1):30-6. Available from: https://ejournals.umn.ac.id/index.php/TI/article/view/4367