Thaenthong, Jirawat, Sara Laeman, and Worarutai Duangdee. “Emergency Notification System With LoRa Technology for Elevator Case Study: Prince of Songkla University, Phuket Campus”. Journal of Science Ladkrabang 29, no. 2 (December 25, 2020): 72–85. Accessed May 19, 2024. https://li01.tci-thaijo.org/index.php/science_kmitl/article/view/240088.