Febrina, Melany, 		Satria, Eko, 		Djamal, Mitra, 		Srigutomo, Wahyu, AND 		Liess, Martin.
" Acoustic CO2 Gas Sensor Based on Phase Difference Measurement" <em>Journal of Science and Applicative Technology</em> [Online], Volume 5 Number 2 (5 October 2021)