Geodesic
Space-time ray method for waves of small deformation in a~nonlinear elastic medium
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 14, Tome 140 (1984), pp. 61-72

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Space-time ray solutions for longitudinal waves of small deformation in a non-linear elastic medium are constructed. 
@article{ZNSL_1984_140_a5,
     author = {A. P. Kachalov},
     title = {Space-time ray method for waves of small deformation in a~nonlinear elastic medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {61--72},
     publisher = {mathdoc},
     volume = {140},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a5/}
}
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A. P. Kachalov. Space-time ray method for waves of small deformation in a~nonlinear elastic medium. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 14, Tome 140 (1984), pp. 61-72. http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a5/