1. The deposition of atmospheric ammonia and its effects on plants;Pearson;New Phytologist,1993
2. Volatilization of ammonia, nitrous oxide and nitric oxide in deep-litter systems for fattening pigs;Groenestein;Journal of Agricultural Engineering Research,1996
3. Microbial processes of the nitrogen cycle in deep-litter systems for pig housing;van Faassen,1992
4. Composting of agricultural waste;Crawford,1985