1. Current data for atmospheric CO2. http://co2now.org/Current-CO2/CO2-Now
2. Earth System Research Laboratory. http://www.esrl.noaa.gov/gmd/ccgg/insitu.html .
3. F. V. Kashin, V. N. Aref’ev, N. E. Kamenogradskii, et al., “Carbon dioxide column in the atmospheric thickness over Central Eurasia (Issyk Kul Monitoring Station),” Izv., Atmos. Ocean. Phys. 43(4), 480–489 (2007).
4. F. V. Kashin, V. N. Aref’ev, V. K. Semenov, et al., “Structure of time variations in carbon dioxide in the atmospheric thickness over Central Eurasia (Issyk Kul Monitoring Station),” Izv., Atmos. Ocean. Phys. 44(1), 90–99 (2008).
5. F. V. Kashin, Yu. I. Baranov, P. P. Tans, and T. J. Conway, “Studies of carbon dioxide, methane and carbon monoxide variations in the air near the ground and in the atmospheric column in the European territory of Russia (Moscow region),” in Extended Abstracts of the Seventh International Carbon Dioxide Conference, Boulder, Colorado, September 25–30, 2005), pp. 269–270.