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Barak, O., 2010, Implicit finite difference in time-space domain with the helix transform: Stanford Exploration Project, Report 140, 103-118.

Claerbout, J. F., 1997, Multidimensional recursive filters via a helix: Stanford Exploration Project, Report 95, 1-13.

Etgen, J. T. and S. Bransdsberg-Dahl, 2009, The pseudo-analytical method: application of pseudo-laplacians to acoustic and acoustic anisotropic wave propagation: SEG Expanded Abstracts, 2552-2556.

Rickett, J., 2001, Spectral factorization of wavefields and wave operators: PhD thesis, Stanford University.