1. Anon., 2009. On the Act relating to the management of biological, geological and landscape diversity (Nature Diversity Act) (Ot.prp.nr.52 (2008-2009) Om lov om forvaltning av naturens mangfold). Recommendation from the Ministry of Environment, Oslo, Norway.
2. Anon., 2002. DN-rapport 2002-1. Nature’s values and services, an assessment of Norwegian nature at the turn of the millennium (Naturens verdier og tjenester, en vurdering av norsk natur ved tusenårsskiftet). Pilotstudie 2000. The Directorate of Nature Management.
3. Anon., 2004. Official Norwegian Report 2004:28 The Act on preserving nature, landscape and biodiversity (Nature Diversity Act). (NOU 2004:28 Lov om bevaring av natur, landskap og biologisk mangfold (Naturmangfoldloven), Ministry of Climate and Environment, Oslo, Norway.
4. Anon., 2006. Regulation no. 1446 Regulation on the framework for water management (Vannforskriften - Forskrift om rammer for vannforvaltningen), Ministry of Climate and Environment and Ministry of Petroleum and Energy, Oslo, Norway.
5. Anon., 2013. Official Norwegian Report no 10 Natural benefits – on values of ecosystem services (NOU 2013:10 Naturens goder – om verdier av økosystemtjenester), The Ministry of Climate and Environment, 26. August 2013, Oslo, Norway.