D. Yugiantoro, E. Nuryanto Budisusila, A. Suprajitno, and A. Marwanto, “Development of a Non-Invasive Anemia Detection System Using Photoplethysmography (PPG) and Fuzzy Logic for Hemoglobin Level Estimation”, JTEMP, vol. 6, no. 2, pp. 153–161, Nov. 2025.