References

• Clayton, R. W., and Engquist, B., 1977, Absorbing boundary conditions for acoustic and elastic wave equations: SSA Bull., 6, 1529-1540.

• Clayton, R. W., and Engquist, B., 1980, Absorbing boundary conditions for wave-equation migration: Geophysics, 45, 895-904.

• Li, Z., 1986, Wave-field extrapolation by the linearly transformed wave equation: Geophysics, 51, 1538-1551.

• Reynolds, A. C., 1978, Boundary conditions for the numerical solution of wave propagation problems: Geophysics, 43, 1099-1110.