1. The influence of solid boundaries upon aerodynamic sound;Curle,1955
2. On sound generated aerodynamically. I. General theory;Lighthill,1952
3. Compressibility effects in unsteady thin-airfoil theory;Amiet;American Institute of Aeronautics and Astronautics Journal,1974
4. Effects of compressibility in unsteady airfoil lift theories;Amiet,1975