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The relation between stress and strain tensor is of the form
7 OV; + Ptj = U' Ekk Sij + z V + A £kk Sii + z (" Eii
Tehe velocity of propagation and the extinction both of compressional and
shear-waves are calculated. The exitation of the waves is assumed to be purely
harmonic and acting at a line of the surface.
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