EVS-EN ISO 3744:1999
Akustika. Müraallikate helivõimsuse taseme määramine helirõhu abil. Tehniline meetod mõõtmiseks peamiselt vabas väljas peegeltasapinna kohal
EN ISO 3744: 1995 ‘Acoustics ? Determination of sound power levels of noise using sound pressure ?
Engineering method in an essentially free field over a reflecting plane’,
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