1. United Nations Environment Program, Montreal protocol on substances that deplete the ozone layer (1987).
2. Global Environmental Change Report, A brief analysis of the Kyoto protocol, 9(24) (1997).
3. A. Cavallini, Int. J. Refrigeration, 19, 485 (1996).
4. Directive 2006/40/EC of the European Parliament and of the Council, Official Journal of the European Union, 14.6 (2006).
5. W. H. Avery and C. Wu, Renewable energy from the ocean-A guide to OTEC, Oxford, Oxford University Press (1994).