1. 1) F. J. Fahy, Sound Intensity, 2nd ed. (E & FN Spon, London, 1995).
2. 2) IEC Publication 61043, "Instruments for the measurement of sound-intensity measurements with pairs of pressure sensing microphones" (1993).
3. 3) American National Standard ANSI S1.9-1996, "Instruments for the measurement of sound intensity" (1996).
4. 4) G. Rasmussen and M. Brock, "Acoustic intensity measurement probe," Proc. Recent Developments in Acoustic Intensity Measurement, Senlis, France, pp. 81–88 (1981).
5. 5) S. Gade, "Validity of intensity measurements in partially diffuse sound field," Brüel & Kjær Tech. Rev., 4, 3–31 (1985).