Adri, Nurul Azizah, et al. “Heart Rate Data Collector for Covid-19 Patient Using IoT and LoRa Network”. Multidisciplinary Applied Research and Innovation, vol. 4, no. 4, Nov. 2023, pp. 192-8, https://penerbit.uthm.edu.my/periodicals/index.php/mari/article/view/8799.