1. 1) Astley, J.: Predicting and Treating Fan and Turbomachinery Noise Current Technology, Research and Facilities, UK-Japan Bilateral Workshop on Aircraft Emissions and Noise, Tokyo, 2006.
2. 2) Schepers, J. G., Wuerz, W., Curvers, A., Mantesanz, A., Oerlemans, S., Garcillán, L., Braun, K., Fischer, M., Lutz, T., Koegler, K., Herrig, A. and Maeder, T.: SIROCCO: Silent Rotors by Acoustic Optimization, Second International Meeting on Wind Turbine Noise, Lyon, France, 2007.
3. 3) Yamamoto, K., Maruta, Y., Goto, M., Kato, H., Ando, Y., Kimura, K. and Saito, S.: Japan Patent Application for Apparatus for Aeroacoustic Noise Reduction of Wind Mill, No. 2003-254225, opened 10 Sep., 2003, and No. 2003-254226, opened 10 Sep., 2003, and No. 2003-254227, opened 10 Sep., 2003.
4. 4) Takagi, S.: Japan Patent Application for Suppression Method of Airfoil Trailing-edge Noise and Low Acoustic Noise Airfoil, No. 2011-099397, opened 19 May, 2011.
5. 5) Takagi, S. and Konishi, Y.: Suppression of Trailing-edge Noise Emitted by Two-dimensional Airfoils, Trans. Jpn. Soc. Aeronaut. Space Sci., 53 (2010), pp. 19-23.