Nezel, Tomas, Ursula E. Spichiger-Keller, Christian Ludin, and Andreas Hensel. “Gas-Selective Optical Sensors for Fire Detectors”. CHIMIA 55, no. 9 (September 26, 2001): 725. Accessed March 29, 2024. https://www.chimia.ch/chimia/article/view/2001_725.