1. Ecological footprint applied to mobile phones;Frey;Journal of Industrial Ecology,2006
2. Huijbergts , M. A. J. L. J. A. Rombouts J. Struijs 2005 Cumulative energy demand as predictor for environmental impacts in life-cycle assessment. Poster at Annual Meeting of SETAC in Europe, Lille, France
3. Van der Voet , E. L. Van Oers S. Moll H. Schütz S. Bringezu S. De Bruyn M. Sevenster G. Warringa 2005 Policy review on decoupling : Development of indicators to assess decoupling of economic development and environmental pressure in the EU-25 and AC-3 countries . CML report 166. Leiden, the Netherlands: Institute of Environmental Sciences (CML), Leiden University, Wuppertal Institute for Climate, Environment and Energy, CE Solutions for Environment, Economy and Technology
4. Wackernagel , M. W. Rees 1998 Our ecological footprint . The New Catalyst Bioregional Series no. 9. Gabriola Island, BC, Canada: New Society Publishers (6th printing)
5. Walk , W. J. Buchgeister L. Schebek 2005 Verification of the cumulative energy demand (CED) as a simplified indicator for LCA. Poster at Annual Meeting of SETAC in Europe, May 22-26, Lille, France