1. Dairy farming systems based on efficient nutrient management;Aarts;Netherlands Journal of Agricultural Science,1992
2. Efficient nutrient management in dairy farming on sandy soils;Aarts;Rapport no. 18,1996
3. Policy Document on Minerals and Ammonia. Ministry of Agriculture, Nature Management and Fisheries,1995
4. The Implementation of Nitrate Policies in Europe: Processes of Change in Environmental Policy and Agriculture,1997