Vol. 6, issue 11, article # 2

pdf Borovoy A. G. Applicability limits of the smooth perturbation method. // Atmospheric and oceanic optics. 1993. V. 6. No. 11. P. 770-774.
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The smooth perturbation method (SPM) or Rytov's method is considered in this paper in the context of more rigorous theory of multiple wave scattering. It is shown that the SPM adequately describes the multiple scattering of waves only by those inhomogeneities of a scattering medium for which an observation point is in their near zone.