1. Abadie LM, Chamorro JM, González-Eguino M (2012) Valuing uncertain cash flows from investments that enhance energy efficiency. J Environ Manag, 116, 113–124
2. Bertoldi P, Boza-Kiss B, Rezessy S (2007) Latest development of energy service companies across Europe: a European ESCO update. DG Joint Research Centre Institute for Energy, European Commission, Brussels
3. CEB (2012) Consorci d’Educació de Barcelona.
http://www.edubcn.cat/ca/
. Accessed June 2, 2012
4. Christopher KJS (2009) Greenhouse gas emissions from global cities. Environ Sci Technol, 43, 7297–7302
5. EU-ESCO (2012) European association of energy service companies.
http://www.eu-esco.org/index.php?id=21
. Accessed May 15, 2012