1. Year-to-year CO2 variations at Amsterdam Island in 1980-83;Ascencio-Parvey;Geophys. Res. Lett.,1984
2. Bacastow, R. B. , Keeling, C. D. , Guenther, P. R. and Moss, D. J. 1982. CO2 reference gas system. Unpublished report of the Scripps Institution of Oceanography, La Jolla, California.
3. Variations of the carbon dioxide content of the atmosphere in the northern hemisphere;Bolin;Tellus,1970
4. Beardsmore, D. J. , Pearman, G. I. , Fraser, P. J. B. and O'Toole, J. G. 1978. The CSIRO (Australia) atmospheric carbon dioxide monitoring program: the first six years of data. CSIRO Division of Atmospheric Physics Technical Paper No. 35. 71 pp.