1. Aas, W., Solberg, S., Manø, S. and Yttrei, K.E, 2007. Overvåking av langtransportert forurenset luft og nedbør (in Norwegian). Atmosfærisk tilførsel, 2006. Report NILU OR 22/2007.
2. Den Store Matvaretabellen (in Norwegian);Anonymous,2001
3. Air Emissions from Animal Feeding Operations: Current Knowledge, Future Needs;Anonymous,2003
4. Sorter og sortsprøving (in Norwegian);Åssveen;Grønn Kunnskap,2004
5. Nitrate leaching and drainage from annual and perennial crops in tiledrained plots and lysimeters;Bergström;J. Environ. Qual.,1987