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The kernel of the integral operator in the nonlinear term of an evolution equation for Rayleigh waves in isotropic solids [E. A. Zabolotskaya, J. Acoust. Soc. Am. 91, 2569–2575 (1992)] is investigated theoretically. The kernel is separated into two parts, one for local nonlinearity and the other for nonlocal nonlinearity. An explicit time domain expression is derived for each part.
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Hamilton et al. (1995) studied this question.
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