Zaker, Ammar, and Mozahem Azzawi. “Detection of Water Vapor and Some Gases Using a Semiconductor Laser”. Journal of Education and Science 19, no. 3 (April 1, 2007): 143–155. Accessed September 10, 2025. https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41283.