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Claerbout, J. F., 1999a, Basic earth imaging: http://sepwww.stanford.edu/sep/prof/index.html.

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Stolt, R. H., 1978, Migration by Fourier transform: Geophysics, 43, no. 1, 23-48.

van Trier, J., and Symes, W. W., 1990, Upwind finite difference calculation of traveltimes: SEP-65, 41-58.