Luthfiyah, Sari, Bedjo Utomo, and Her Gumiwang Ariswati. “Use Chest Vibrator to Prevent Pulmonary Infection in Patients With COPD ”. Indonesian Journal of Electronics, Electromedical Engineering, and Medical Informatics 1, no. 2 (August 20, 2025): 81–84. Accessed April 19, 2026. https://mail.ijeeemi.org/index.php/ijeeemi/article/view/255.