Open rotors / Propfans
Berton, J.J., Empennage Noise Shielding Benefits for an Open Rotor Transport, NASA TM-2012-217218, NASA Glenn Research Centre, OH, USA
Croft, J., Open Rotor Noise not a Barrier to Entry: GE, Flight Intl/FlightGlobal, July 2012.
Van Zante, D., Reestablishing Open Rotor as an Option for Significant Fuel Burn Improvements, NASA Presentation at AIAA Aerosciences Meeting, Jan 2011.