Mahdi, Ibtehal F., Mohanad M. Azzawi, and Firas S. Mohammed. “Development of NDIR CO2 Gas Sensing System Based on U-Shaped Optical Cavity”. Al-Mustansiriyah Journal of Science 33, no. 4 (December 30, 2022): 136–140. Accessed July 25, 2024. https://mjs.uomustansiriyah.edu.iq/index.php/MJS/article/view/1184.