1. V. A. Gordienko, Vector-Phase Methods in Acoustics (Fizmatlit, Moscow, 2007) [in Russian].
2. F. J. Fahy, Sound Intensity, 2nd ed. (Elsevier, London, 1989).
3. V. P. Dzyuba, Scalar-Vector Methods of Theoretical Acoustics (Dalnauka, Vladivostok, 2006) [in Russian].
4. D. R. dall’Osto, J. Acoust. Soc. Am. 138, 1767 (2015). https://doi.org/10.1121/1.4933587
5. P. N. Morse and K. U. Ingard, Theoretical Acoustics (McGraw-Hill, New York, 1968).