1. Survey of ammonia concentrations in livestock buildings;Seedorf;Journal of Agricultural Science, Cambridge,1999
2. NECD common position, [2000].
3. Covering slurry stores to reduce ammonia emissions: settling effects and chemical composition changes;Portejoie,2002
4. Ammonia losses from pig slurry storage: first results of field tests;Balsari,1994
5. Malodour abatement by different covering materials;Bundy,1997