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Foreman, T. L., 1989, An exact ray theoretical formulation of the Helmholtz equation: J. Acoust. Soc. Am., 86, 234-246.

Sava, P., and Fomel, S., 2003, Seismic imaging using Riemannian wavefield extrapolation: SEP-114, 1-30.

Stoffa, P. L., Fokkema, J. T., de Luna Freire, R. M., and Kessinger, W. P., 1990, Split-step Fourier migration: Geophysics, 55, no. 04, 410-421.


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