An, Thai, Le Long, Vuong Nhi, Vu Thien, Phung Hanh, Nguyen Thanh Hai, and Nguyen Minh. “Design of an Iot Check-in System Controlling the Ministry of Health’s 5k Regulation”. VNUHCM Journal of Engineering and Technology 8, no. 2 (June 30, 2025): 2565-2572. Accessed October 14, 2025. http://stdjet.scienceandtechnology.com.vn/index.php/stdjet/article/view/1115.