Klecha, T. “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”. Archives of Mechanics 48, no. 3 (June 30, 1996): 513–539. Accessed March 3, 2026. http://am.ippt.gov.pl/index.php/am/article/view/v48p513.