Dang, Dinh Nhu, et al. “A Simple and Real-Time Support System for Firefighters Using Low-Cost 3-DOF Accelerometer and CO Sensor”. International Journal of Online and Biomedical Engineering (iJOE), vol. 18, no. 10, July 2022, pp. pp. 4-25, doi:10.3991/ijoe.v18i10.26425.