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2. J.W. Strutt (Baron Rayleigh): On waves propagated along the plane surface of an elastic solid, Proc. Lond. Math. Soc. 17, 4 (1885)
3. J.W. Strutt (Baron Rayleigh): The Theory of Sound (MacMillan, London 1896), Reprinted by Dover, New York 1945
4. G. Benedek, J.P. Toennies: Atomic-Scale Dynamics at Surfaces – Theory and Experimental Studies with Helium Atom Scattering (Springer, Berlin, Heidelberg 2018), Chap. 3
5. Landolt-Börnstein, New Ser., Subvol. 45A;G Benedek,2015