1. Background trace gas concentrations in the Central United States;Breeding;J. geophys. Res.,1973
2. Published regulatory guidelines of environmental concern to the oil industry in western Europe;CONCAWE,1976
3. Desulphunzation of Fuels and Combustion Gases;Economic Commision for Europe,1971
4. The Second Seminar on Desulphunzation of fuels and combustion gases;Economic Commission for Europe,1976
5. The yearly circulation of sulfur in nature;Eriksson;J. Geophys. Res.,1963