1. ASTM E597-77T;Tentative recommended practice for determining a single number rating of airborne sound isolation in multi-unit building specifications,1977
2. Measurement of sound insulation in buildings and of building elements;BS2750,1980
3. Measurement of sound insulation in buildings and of building elements;ISO 140,1978
4. Interference patterns in reverberant sound fields;Waterhouse;J. Acoust. Soc. Am.,1955
5. The enigma of sound power measurements at low frequencies;Brüel;Brüel and Kjaer Technical Review No. 3,1978