1. 1Nichols,H.E."UDFTMEngine/MD-80FlightTestProgram,"AIAA88-2805,1988.
2. 2Harris,R.W.,andCuthbertson,R.D."UDFTM/727FlightTestProgram,"AIAAPaper87-1733,1987.
3. 3Blythe,A.A.,andSmith,P."ProspectsandProblemsofAdvancedOpenRotorsforCommercialAircraft,"AIAAPaper85-1191, 1985.
4. The NASA Environmentally Responsible Aviation Project/General Electric Open Rotor Test Campaign