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3. Brandt O. Sound insulation requirements between dwellings. In: Proceedings of the 4th international congress on acoustics, vol. 2. Copenhagen; 21–28 August 1962. p. 31–54.
4. ISO 717-1. Acoustics – rating of sound insulation in buildings and of building elements – Part 1: airborne sound insulation; 2013.
5. ISO 140-4. Acoustics – Measurement of sound insulation in buildings and of building elements – Part 4: field measurements of airborne sound insulation between rooms; 1998.