1. Forms and concentration of phosphorus in drainage water of twenty-seven tile-drained soils;Beauchemin;Journal of Environmental Quality,1998
2. Collection and evaluation of large soil monoliths for soil and crop studies;Belford;Journal of Soil Science,1979
3. Berge , D. Källqvist , T. 1990 Biotilgjengelighet Av Fosfor I Jordbruksavrenning. Sammenliknet Med Andre Forurensningskilder, Sluttrapport
4. Council of the European Communities 1980 Directives of 15 July, 1980, Relating to the Quality of Water Intended for Human Consumption