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Effects of very high-frequency sound and ultrasound on humans. Part I: Adverse symptoms after exposure to audible very-high frequency sound: The Journal of the Acoustical Society of America: Vol 144, No 4
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There's life above 20 kilohertz! A survey of musical instrument spectra to 102.4 kHz
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The sounds of frequencies greater than 20 kHz are called ultrasonic sounds.
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