1. A.D. Pierce: Acoustics: An Introduction to Its Physical Principles and Applications, 2nd ed. (Acoustical Society of America, New York, 1989)
2. F.J. Fahy: Sound Intensity, 2nd ed. (E & FN Spon, London, 1995)
3. J.A. Mann III, J. Tichy, A.J. Romano: Instantaneous and time-averaged energy transfer in acoustic fields, J. Acoust. Soc. Am. 82, 17–30 (1987)
4. F. Jacobsen: A note on instantaneous and time-averaged active and reactive sound intensity, J. Sound Vib. 147, 489–496 (1991)
5. ISO 3745 Acoustics—Determination of sound power levels of noise sources using sound pressure—Precision methods for anechoic and hemi-anechoic rooms (2003)