Khandaker, S., M. M. Hasan, N. Shaipuzaman, M. A. S. M. Aspar, and H. Manap. “Development of DOAS System for Hazardous Methane Detection in the Near-Infrared Region ”. EMITTER International Journal of Engineering Technology, Vol. 12, no. 2, Jan. 2025, pp. 182-95, doi:10.24003/emitter.v12i2.890.