Geodesic
Asymptotic solutions of the second order system of differential equations concentrated in a vicinity of a ray
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 170-179 Cet article a éte moissonné depuis la source Math-Net.Ru

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Formal asymptotic solutions of the second order system of differential equations on a smooth Riemannian manifold concentrated in the vicinity of a fixed ray are constructed by means of the ray method with complex eikonal. 
@article{ZNSL_1981_104_a16,
     author = {V. E. Nomofilov},
     title = {Asymptotic solutions of the second order system of differential equations concentrated in a~vicinity of a~ray},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {170--179},
     year = {1981},
     volume = {104},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a16/}
}
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V. E. Nomofilov. Asymptotic solutions of the second order system of differential equations concentrated in a vicinity of a ray. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 170-179. http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a16/