Amri I, Pebralia J. A SIMPLE OF IOT BASED SOCIAL CONTACT TRACKING FOR INFECTIOUS PATIENT USING ULTRASONIC SENSOR: A PRELIMINARY STUDY. JoP [Internet]. 2022 Jun. 23 [cited 2026 May 8];7(2):19-23. Available from: https://www.online-journal.unja.ac.id/jop/article/view/18192