1. Dutch Ministry of economic affairs, 2001, "Bestuursovereenkomst Landelijke Ontwikkeling Windenergie (Blow)", accesseble athttp://apps.ez.nl/publicaties/pdfs/blow-bw1.pdf.
2. Laddermill, a novel concept to exploit the energy in the airspace
3. Etkin,B.,DynamicsofAtmosphericFlight,Wiley,NewYork,1972.