1. Quasi-biennial variations in temperature, total ozone, and tropospheric height;Angell;Monthly Weather Review,1964
2. Quasi-biennial and long-term fluctuations in total ozone;Angell;Journal of the Atmospheric Sciences,1973
3. Effect of ozone depletion on atmospheric CH4 and CO concentrations;Bekki;Nature,1994
4. Bojkov, R. Hudson, R., 1991. Ozone Variability and Trends. WMO, Section 4.2.1
5. Dlugokencky, E., Lang, P. Masarie, K., Steele, L., 1997. Atmospheric methane mixing ratios – The NOAA/CMDL Global Cooperative Air Sampling Network, 1983–1993. Technical Report, Carbon Dioxide Information Analysis Center