1. Acoustical Measurements;Beranek,1988
2. Pressure microphones for intensity measurements with significantly improved phase properties;Frederiksen;Brüel & Kjaer Tech. Rev.,1986
3. A field calibrated real time system for intensity measurements;Nielsen,1988
4. Characteristics of intensity measuring equipment;Brüel;Noise Control Engng J.,1989
5. Sound Intensity;Fahy,1989