1. Alexandersson, H., Karlström, C., Larsson-McCann, S., 1991. Temperaturen och nederbörden i Sverige 1961–1990. Referensnormaler. (Temperature and precipitation in Sweden 1961–1990, reference normal) SMHI Meterologi 81, Norrköping. 87 pp. (in Swedish with an English summary).
2. Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998. Crop Evapotranspiration—Guidelines for Computing Crop Water Requirements–FAO Irrigation and Drainage Paper 56, FAO–Food and Agriculture Organization of the United Nations, Rome, Italy, 293 pp.
3. Andersson, S., 1955. Markfysikaliska undersökningar i odlad jord. VIII. En experimentell metod. (Soil physical measurements in arable land. VIII. An experimental method) Grunddförbättringar 8, specialnummer 2. (in Swedish).
4. Nitrate losses from agricultural land;Armstrong,1993
5. Simulating nitrogen leaching and turnover in a subsurface-drained grassland receiving animal manure in Northern Germany using DRAINMOD–N II;Bechtold;Agric. Water. Manage.,2007