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A UNIFIED APPROACH TO RAY BENDING, RAY PERTURBATION AND PARAXIAL RAY THEORIES
R. Snieder, C. Spencer Published for the Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft, and the European Geophysical Society by Blackwell Scientific Publications 1993 Geophysical journal international Vol.115 No.2
RAY PERTURBATION-THEORY FOR TRAVEL-TIMES AND RAY PATHS IN 3-D HETEROGENEOUS MEDIA
R. Snieder, M. Sambridge Published for the Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft, and the European Geophysical Society by Blackwell Scientific Publications 1992 Geophysical journal international Vol.109 No.2