T. Vuong Dinh, J. Won Ahn, I. Young Choi, and J. Chun Kim, “A Case Study on Relationship between Optical Path Length and Detection Limit of an NO Non-Dispersive Infrared Analyzer”, IJET, vol. 7, no. 3.7, pp. 399–402, Jul. 2018, doi: 10.14419/ijet.v7i3.7.18888.