Akustika – Referentna nula za kalibraciju audiometrijske opreme – Deo 3: Referentni ekvivalentni prag nivoa sile za čiste tonove i koštane vibratore
Acoustics - Reference zero for the calibration of audiometric equipment - Part 3: Reference equivalent threshold force levels for pure tones and bone vibrators (ISO 389-3:1994)