1. Awerbuch S. and Martin Berger: 2003. Energy security and diversity in the EU: a mean-variance portfolio approach. IEA/IET Working Paper 2003/03, Paris, February 2003, http://www.iea.org/textbase/papers/2003/port.pdf
2. Analytical Methods for Energy Diversity and Security;Bazilian,2008
3. Berger, M. 2003. Portfolio analysis of EU electricity generating mixes and its implications for renewable. Ph.D. Dissertation, Technischen Universität, Wien, Vienna.
4. Commission of the European Communities, 2008. Communication from the Commission. 20 20 by 2020: Europe's climate change opportunity, COM(2008) 30 final, Brussels, 23.1.2008
5. Digest of UK Energy Statistics;Department of Business, Enterprise and Regulatory Reform,2008