1. The S-rotor and its applications;Savonius;Mechanical Engineering,1931
2. Turbine having its rotating shaft transverse to the flow of the current;Darrieus,1931
3. The story of the rotor;Flettner,1926
4. Home built, Savonius oil-barrel rotor,1977
5. Design and construction of a vertical-axis windmill using sails;Newman;Energy Conversion,1978