1. Aarnink, A.J.A., Wagemans, M.J.M. and Keen, A., 1993. Factors affecting ammonia emission from housing for weaned piglets. In: Verstegen, M.W.A., Den Hartog, L.A., Van Kempen, G.J.M. and Metz, J.H.M. (ed.) Nitrogen flow in pig production and environmental consequences. Pudoc Scientific Publishers, Wageningen, the Netherlands, pp. 286-294.
2. J.H.M. MetzNitrogen flow in pig production and environmental consequences1993286294
3. Ammonia and greenhouse gas emissions from a straw flow system for fattening pigs: Housing and manure storage
4. Ammonia and greenhouse gas emissions from a straw flow system for fattening pigs: Housing and manure storage
5. Andersson, M., 1995a. Ammonia volatilization from cow and pig manure. Sveriges lantbruksuniversitet, institutionen för jordbrukets biosystem och teknologi, Report 98, Lund, Sweden, 66 pp.