1. Quantitative Seismology 2;Aki,1980
2. An introduction to the use of splines in computer graphics;Bartels,1985
3. Ray synthetic seismograms for complex two-dimensional and three-dimensional structures;Cerveny;J. Geophys.,1985
4. Ray method in seismology;Cerveny,1977
5. Imaging the Earth Interior;Claerbout,1985