Geodesic
On a point source of harmonic oscillations in a homogeneous anisotropic elastic medium
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 25, Tome 230 (1995), pp. 14-20 
V. M. Babich. On a point source of harmonic oscillations in a homogeneous anisotropic elastic medium. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 25, Tome 230 (1995), pp. 14-20. http://geodesic.mathdoc.fr/item/ZNSL_1995_230_a1/
@article{ZNSL_1995_230_a1,
     author = {V. M. Babich},
     title = {On a~point source of harmonic oscillations in a~homogeneous anisotropic elastic medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {14--20},
     year = {1995},
     volume = {230},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1995_230_a1/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

A point source of harmonic oscillations in an infinite homogeneous anisotropic elastic space is considered. It is shown that everywhere, except for certain directions, the phase function of the problem solution can be determined by applying the Legendre transform to the characteristic function of the equations. The group velocity of the solution is directed from the point source precisely along the radius. Bibl. 2 titles.