1. Factor Four: Doubling Wealth, Halving Resource Consumption, A Report to the Club of Rome;von Weizsäcker,1997
2. Controllable and affordable utility scale electricity from intermittent wind resources and compressed air energy storage (CAES);Cavallo;Energy,2007
3. Pacific Northwest Laboratory (PNL), 7789, UC-261;Elliott,1991
4. Bidders emerge for round three licences;Massey;WindPower Monthly,2009