1. ISO 9612:2009 Acoustics—Determination of Occupational Noise Exposure—ENGINEERING Method,2009
2. IEC 61672-1: Electroacoustics—Sound Level Meters—Part 1: Specifications,2013
3. IEC 61252:1993: Electroacoustics—Specifications for Personal Sound Exposure Meters,1993
4. VDI 3766:2012-09: Ultraschall—Arbeitsplatz—Messung, Bewertung, Beurteilung und Minderung/Ultrasound—Work Place—Measurement, Assessment, Judgement and Reduction;DIN Deutsches Institut für Normung,2012
5. Ultrasonic Noise Sources in a Work Environment