1. SCOPE;HJ Bolle,1986
2. Bouwman AF (1989) The role of soils and land use m the greenhouse effect. Background paper of the international conference ?Soils and the Greenhouse Effect?. August 14?18, Wageningen, The Netherlands, Int Soil Ref and Info Cnt.
3. Bremner JM and Blackmer AM (1981) Terrestrial nitrification as a source of atmospheric nitrous oxide. In: Delwiche CC, ed. Denitrification, nitrification, and atmospheric nitrous oxide, pp 151?170. Wiley, New York
4. Brown LR and Flavin R (1988) The earth's vital signs. In: State of the World. Worldwatch Institute/WW Norton and Co. New York, New York
5. Crutzen PJ (1981) Atmospheric chemical processes of the oxides of nitrogen, including nitrous oxide. In: Delwiche CC, ed. Denitrification, nitrification, and nitrous oxide, pp 17?44. Wiley, New York