DS 2186.1:1982 Acoustics. Rating of sound insulation in buildings and of building elements. Part 1: Airborne sound insulation in buildings and of interior building elements
2013DS/EN ISO 717-1:2013 Acoustics - Rating of sound insulation in buildings and of building elements - Part 1: Airborne sound insulation
0000 DS/EN ISO 717-1:1997
1982DS 2186.1:1982 Acoustics. Rating of sound insulation in buildings and of building elements. Part 1: Airborne sound insulation in buildings and of interior building elements