1 Lehmer, D. H., "The machine tools of combinatorics in: In applied combinatorial mathematics" John Wiley 5-31, 1964
2 Hron, F., "Numerical methods of ray generation in multilayered media in: Methods in Computational Physics, Seismology: Body Waves and Sources" Academic Press Inc. 1-34, 1972
3 Engelkemeir, R., "Multimode theoretical seismograms using automatic ray generation" Colorado School of Mines 1979
4 Cerveny, V., "Complete seismic-ray tracing in three-dimensional structures in : Seismological Algorithms, Computational Methods and Computer Programs" Academic Press 89-168, 1988
5 Vered, M., "Application of synthetic seismograms to the study of low magnitude earthquakes and crustal structure in the northern Red sea region" 64 : 1221-1237, 1974
6 이희일, "3-dimensional ray-tracing and cross-hole tomography" University of Joseph Fourier 1990