“Ammonia Gas Sensing Properties of GeO2:SnO2 Si Thin Films Prepared via Pulsed Laser Deposition”. Journal of Physical Science 37, no. 2 (August 28, 2026): 103–121. Accessed September 6, 2026. https://ejournal.usm.my/jps/article/view/jps_vol37-no-2-2026_7.