1. The effect of hub-fairings on wind-turbine rotor performance;Wilson;Journal of Fluids Engineering,1978
2. Centre-body effects on horizontal axis wind-turbines;Griffiths,1982
3. Wind-turbine project WPB 144;New York University, College of Engineering,1946
4. Power from the wind;Putman,1948
5. The effect of a centre-body on axial flow windmill performance;Blaha,1978