[116] Bach, H., Christensen, N. Kristensen, P (Eds.) 2002: The State of the Environment in Denmark, 2001, NERI Technical Report No. 409, Roskilde: National Environmental Research Institute, p. 102. Voir aussi Danish Government, 2002: Denmark's National Strategy for Sustainable Development "A Shared Future - Balanced Development", Indicator Report, Copenhagen: Danish Environmental Protection Agency, p. 47.
[116] Bach, H., Christensen, N. Kristensen, P (Red.) 2002: The State of the Environment in Denmark, 2001, NERI Technical Report N° 409, Roskilde: National Environmental Research Institute, blz. 102. Zie ook: Danish Government, 2002: Denmark's National Strategy for Sustainable Development "A Shared Future - Balanced Development", Indicator Report, Kopenhagen: Danish Environmental Protection Agency, blz. 47.