Bashi, Omar I. Dallal, W. Z. Wan Hasan, N. Azis, S. Shafie, and Hiroaki Wagatsuma. 2018. “Autonomous Quadcopter Altitude for Measuring Risky Gases in Hazard Area”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 10 (2-5):31-34. https://jtec.utem.edu.my/jtec/article/view/4345.