1. DIN 52211:1953. Schalldämmzahl und Norm-Trittschallpegel.
2. ISO-R 140:1960: Field and laboratory measurements of airborne and impact sound transmission.
3. ISO-R 717:1968: Rating of sound insulation in dwellings.
4. Technical problems in impact noise testing;Mariner;Build Res,1964
5. A new system for rating impact sound insulation;Gerretsen;Appl Acoust,1976