1. FletcherH. S. “Experimental Investigation of Lift, Drag and Pitching Moment of Five Annular Airfoils,” NACA TN 4117, 1957.
2. The design of screw-propellers in nozzles1
3. MortK. W.YaggyP. F. “Aerodynamic Characteristics of a 4-Foot Diameter Ducted Fan Mounted on the Tip of a Semispan Wing,” NASA TN D-1301, 1962.
4. DESIGN AND PERFORMANCE OF PROPELLERS AND PUMPJETS FOR UNDERWATER PROPULSION
5. RyallD. L.CollinsI. F. “Design and Test of a Series of Annular Airfoils,” Admiralty Research Lab. Rept. A.R.L./R3/G/AE/2/5, ARL/G/R6, Teddington, England, U.K. March 1965.