Salim, M. R.; Ibrahim, M. H.; Azmi, A. I.; Mohd Noor, M. Y.; Abdullah, A. S.; Ngajikin, N. H.; Dooly, G.; Lewis, E. Measurement of Carbon Dioxide Using Low-Cost &Amp; Compact Spectroscopy Based Gas Sensor. JTEC 2018, 10, 127-132.