“Wavefront curvatures in three-dimensional laterally inhomogeneous media with curved interfaces” (Hubral, 1980, this issue) shows a differential equation [formula (4.1)] which describes the alteration of the wavefront curvature matrix along a raypath in the case of an isotropic velocity v which is an arbitrary function of the locus in the three-dimensional space. Hubral derives his equation by referring to papers of Popov and Pšenĉik (1976, 1978) and Hubral (1979).

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