1. D.I. Blokhintsev, Acoustics of Inhomogeneous Media in Motion [in Russian], Nauka, Moscow (1981).
2. E.P. Stolyarov, “Propagation of Weak Vortex and Entropy Waves in Potential Flows of a Compressible Ideal Gas,” Uch. Zap. TsAGI, 11, No. 3, 1 (1980).
3. E.P. Stolyarov, “Sound Excitation by Small Entropy and Vorticity Disturbances in Spatially Nonuniform Flows of a Compressible Ideal Gas,” in: Acoustics of Turbulent Flows [in Russian], Nauka, Moscow (1983), p. 3.
4. V.V. Struminskii, “A New Line of Inquiry in the Turbulence Problem,” in: Turbulent Flows [in Russian], Nauka, Moscow (1977), p. 20.
5. J.F. Clarke and M. McChesney, The Dynamics of Real Gases, Butterworths, London (1964).