Acoustics - Determination and application of measurement uncertainties in building acoustics - Part 2: Sound absorption (ISO 12999-2:2020); German version EN ISO 12999-2:2020— 18 стр.
Acoustics - Determination and application of measurement uncertainties in building acoustics - Part 2: Sound absorption (ISO/DIS 12999-2:2019); German and English version prEN ISO 12999-2:2019