Ravindran D, Jumadi NA. Development of IoT-Based Heart Rate and Oxygen Saturation Alert System for COVID-19 Wards. EEEE [Internet]. 2022 Nov. 14 [cited 2024 Jul. 18];3(2):211-22. Available from: https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/8595