1. Principles of energy extraction from a free stream by means of wind turbines;Riegler;Wind Eng,1983
2. Introduction to the theory of flow machines;Betz,1966
3. Ultra low head hydroelectric power generation using ducted vertical axis water turbines;Davis,1981
4. Ultra low head hydroelectric power generation using ducted vertical axis water turbines;Davis,1983
5. The ducted vertical axis hydro turbine for large scale tidal energy applications;Davis,1984