Sun, Er-hua, and Yu Chen. “Multi-Layer Wireless Perception and Recognition Technology Based on Internet of Things”. International Journal of Online and Biomedical Engineering (iJOE) 15, no. 01 (January 17, 2019): pp. 31–43. Accessed April 27, 2024. https://online-journals.org/index.php/i-joe/article/view/9776.