[1]
T. Klecha, “Surface stress waves in a nonhomogeneous elastic half-space. Part II. Existence of surface waves for an arbitrary variation of Poisson’s ratio. Approximate solution based on perturbation methods”, Arch. Mech., vol. 48, no. 3, pp. 513–539, Jan. 1996, doi: 10.24423/aom.1354.