1. Ducted propellers – a critical review of the state of the art;Sacks;Prog. Aerosp. Sci.,1962
2. Experimental investigation of lift, drag, and pitching moment of five annular airfoils;Fletcher,1957
3. A Theory of the Ducted Propeller with a Finite Number of Blades;Morgan,1961
4. Predicted and measured performance of two full-scale ducted propellers;Kriebel,1964
5. Shrouded propellers – a comprehensive performance study;Black,1968