. . "Prop-fan technology." . . "Noise prediction (Aircraft)" . . "Turboprop engines." . . "Noise measurement." . . "Comparison." . . "Flight paths." . . "Aircraft noise." . . "Comparison of advanced turboprop and conventional jet and propeller aircraft flyover noise annoyance preliminary results"@en . "Comparison of advanced turboprop and conventional jet and propeller aircraft flyover noise annoyance preliminary results" . . . . . . . . . . . . . . . . .