1. Vertical Take-off and Landing Aaircraft;Campbell,1962
2. Research on VTOL and STOL aircraft in the United States;Campbell;Aadvances in Aeronautical Sciences,1959
3. Stability and control of the Aerial Jeep;Mckinney;SAE Annual Meeting,1959
4. Wind tunnel investigation of a small scale model of an aerial vehicle supported by ducted fans;Parlett;NASA TN D-377,1960
5. Stability and control characteristics of a model of an aerial vehicle supported by two ducted fans;Parlett;NASA TN D-920,1961