Setyawati, Riska. “An Improved Measurement Accuracy of Fetal Heart Rate Using Digital Filter”. Indonesian Journal of Electronics, Electromedical Engineering, and Medical Informatics 2, no. 3 (August 17, 2025): 136–142. Accessed May 26, 2026. https://www.ijeeemi.org/index.php/ijeeemi/article/view/222.