Febrina, M., 		Satria, E., 		Djamal, M., 		Srigutomo, W., & 		Liess, M.
(2021).
 Acoustic CO2 Gas Sensor Based on Phase Difference Measurement.
<em>Journal Of Science And Applicative Technology, 5</em>(2), 397-402.
doi:10.35472/jsat.v5i2.680