Popa, M. E., Vollmer, M. K., Jordan, A., Brand, W. A., Pathirana, S. L., Rothe, M., & Röckmann, T. (2014). Vehicle emissions of greenhouse gases and related tracers from a tunnel study: CO : CO<sub>2</sub>, N<sub>2</sub>O : CO<sub>2</sub>, CH<sub>4</sub> : CO<sub>2</sub>, O<sub>2</sub> : CO<sub>2</sub> ratios, and the stable isotopes <sup>13</sup>C and <sup>18</sup>O in CO<sub>2</sub> and CO. Copernicus Publications.
Chicago-viite (17. p.)Popa, M. E., M. K. Vollmer, A. Jordan, W. A. Brand, S. L. Pathirana, M. Rothe, ja T. Röckmann. Vehicle Emissions of Greenhouse Gases and Related Tracers from a Tunnel Study: CO : CO<sub>2</sub>, N<sub>2</sub>O : CO<sub>2</sub>, CH<sub>4</sub> : CO<sub>2</sub>, O<sub>2</sub> : CO<sub>2</sub> Ratios, and the Stable Isotopes <sup>13</sup>C and <sup>18</sup>O in CO<sub>2</sub> and CO. Copernicus Publications, 2014.
MLA-viite (9. p.)Popa, M. E., et al. Vehicle Emissions of Greenhouse Gases and Related Tracers from a Tunnel Study: CO : CO<sub>2</sub>, N<sub>2</sub>O : CO<sub>2</sub>, CH<sub>4</sub> : CO<sub>2</sub>, O<sub>2</sub> : CO<sub>2</sub> Ratios, and the Stable Isotopes <sup>13</sup>C and <sup>18</sup>O in CO<sub>2</sub> and CO. Copernicus Publications, 2014.