Agency for the Environment FOEN (2010). "Redistribution of CO2 tax". Agency for the Environment FOE. p. 1. Archived from the original on 1 May 2011. Retrieved 9 August 2010.
Agency for the Environment FOEN (2010). "Companies exceed CO2 targets in 2009". Federal Office for Environment. p. 1. Archived from the original on 20 July 2007. Retrieved 9 August 2010.
Agency for the Environment FOEN (2010). "Redistribution of CO2 tax". Agency for the Environment FOE. p. 1. Archived from the original on 1 May 2011. Retrieved 9 August 2010.
Agency for the Environment FOEN (2010). "Companies exceed CO2 targets in 2009". Federal Office for Environment. p. 1. Archived from the original on 20 July 2007. Retrieved 9 August 2010.