1. 1) S. Kuwano, “Psychological evaluation of sound quality of machinery noise,” J. Acoust. Soc. Jpn. (J), 53, 456–461 (1997).
2. 2) S. Kuwano, F. Hugo, S. Namba, S. Nakamura and H. Uchida, “Psychological evaluation of door sound of cars in relation to the class of cars,” Proc. Spring Meet. Acoust. Soc. Jpn., 1-7-8, pp. 745–746 (2002).
3. 3) K. Abe, K. Ozawa, Y. Suzuki and T. Sone, “Evaluation of environmental sounds using adjectives describing sound quality, emotional state, and information carried by sound,” J. Acoust. Soc. Jpn. (J), 54, 343–350 (1997).
4. 4) K. Taki, N. Okubo, T. Toi and S. Okawa, “Evaluation of sound quality and investigation of noise source for household sewing machine,” Proc. Spring Meet. Acoust. Soc. Jpn., 2-10-1, pp. 745–746 (2001).
5. 5) P. G. Hoel, Elementary Statistics (Baifukan, Tokyo, 1981), pp. 191–216.