New routines of the two-point ray tracing algorithm, connecting two-point ray tracing with initial-value ray tracing, are discussed. Example of two-point ray tracing in 3-D is given.
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Bulant, P.: Two-point ray-tracing and controlled initial-value ray-tracing in 3-D heterogeneous block structures. Journal of Seismic Exploration, 8 (1999), 57-75.