1. Planning a new era in air transport efficiency;Kramer;Astronaut. Aeronaut.,1978
2. Propulsion;Nored;Astronaut. Aeronaut.,1978
3. General characteristics of fuel conservation prop-fan propulsion system;Gatzen;SAE Paper No. 751085,1975
4. The NASA high-speed turboprop program;Dugan;NASA TM81561,1980
5. A Report on the aerodynamic design and wind tunnel test of a prop-fan model;Rohrbach;AIAA Paper 76-667,1967