References

• Cervený, V., 1987, Ray tracing algorithms in three-dimensional laterally, varying layered structures: Seismic Tomography, edited by G. Nolet, Riedel Publishing Company, 99-134.

• Langan, R.T., Lerche, I., and Cutler, R.T., 1985, Tracing of rays through heterogeneous media: an accurate and efficient procedure: Geophysics, 50, 1456-1465.

• Larner, K.L., Hatton, L., Gibson, B.S., and Hsu, I.G., 1981, Depth migration of imaged time sections: Geophysics, 46, 734-750.

• Nolet, G., 1987, Seismic wave propagation and seismic tomography: Seismic Tomography, edited by G. Nolet, Riedel Publishing Company, 1-24.

• Van Trier, J., 1988, Vectorized initial-value ray tracing for arbitrary velocity models: SEP-57, 279-287.

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

• Vidale, J., 1988, Finite-difference calculation of traveltimes: Bull., Seis. Soc. Am., 78, no.6, 2062-2076.