1. [1] Kawaguchi, T., Kozuma, Y. and Kitagawa, T., "Investigation of high-frequency sounds radiated from Japanese railway on curved tracks," EURONOISE 2012, 2012.
2. [2] Toida, T., Furuta, S. and Ogata, S., "High-frequency noise radiated from Shinkansen," the Institute of Noise Control Engineering of Japan (spring term), pp.749-752, 2006 (in Japanese).
3. [3] Nagakura, K., "Method of analyzing the wind tunnel test data measured with directional microphone systems," Quarterly Report of RTRI, Vol.42, No.2, pp.104-109, 2001.
4. [4] Kitagawa, T., Murata, K. and Zenda, Y., "Analysis about Vibration and Sound Generated by Wheels," RTRI REPORT, Vol.15, No.5, pp.47-52, 2001 (in Japanese).