1. Review of research in Sweden;Bergdahl,1992
2. IPS wave power buoy Mark IV;Fredrikson,1992
3. The Danish Wave Energy Programme;Nielsen,1998
4. Survey of Energy Resources, Interim Update 2009, London, UK;Officers of World Energy Council,2009
5. International Energy Agency Implementing Agreement on Ocean Energy Systems (IEA—OES), Lisbon, Portugal,2008