* The "easyJet ecoJet" to cut CO2 emissions by 50% by 2015* The Short, Happy Life of the Prop-fan Air & Space Magazine, September 1, 2005* “open rotor” jet engine* "Metrovick F.5 - Open-Fan Thrust Augmenter" a 1947 "Flight" article on an early propfan
", Flight International, June 12, 2007.