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2. ApSimon H. M. (Ed.) (1994) The potential for abatement of ammonia emission from agriculture and the associated costs. Proceedings of the Workshop Culham, Nov. 1994, Imperial College Centre for Environmental Technology, London, U.K.
3. Reducing the contribution of ammonia to nitrogen deposition across Europe;ApSimon;Water, Air and Soil Pollution,1995
4. Ammonia emission in Europe;Asman,1992
5. European transboundary acidifying air pollution;Barrett,1995