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3. ISO 1996. (1982). Acoustics ? Description and measurement of environmental noise ? Part 1: Basic quantities and procedures.
4. Iwahara, S. (1964). Non-parametric Methods. Tokyo: Nihon-Bunka-Kagaku-sha.
5. Kuwano, S., Namba, S., & Kato, T. (1978) The loudness of impulsive sound. Journal of the Acoustical Society of Japan, 34, 316?317 (in Japanese).