1. P. C. Novelli, K. A. Masarie, and P. M. Lang, “Distributions and Recent Changes in Carbon Monoxide in the Lower Troposphere,” J. Geophys. Res. 103(19), 015–033 (1998).
2. A. M. Thompson, R. J. Cicerone, “Possible Perturbations to Atmospheric CO, CH4, and OH,” J. Geophys. Res. 91(10), 853–864 (1986).
3. M. A. K. Khalil, J. P. Pinto, and M. J. Shearer, “Preface Atmospheric Carbon Monoxide,” Chemosphere: Global Change Science 1(1–3), 1–375 (1999).
4. L. N. Yurganov, P. Duchatelet, A. V. Dzhola, et al., “Increased Northern Hemispheric Carbon Monoxide Burden in the Troposphere in 2002 and 2003 Detected from the Ground and from Space,” Atmos. Chem. Phys. 5(2), 563–573 (2005).
5. D. P. Edwards, L. K. Emmons, and D. A. Hauglustaine, “Observations of Carbon Monoxide and Aerosols from the Terrasatellite: Northern Hemisphere Variability,” J. Geophys. Res. 109, doi: 10.1029/2004JD004727, D24202 (2004).