Geodesic
A coordinate system for describing the “quasiphoton”
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 14, Tome 140 (1984), pp. 73-76 Cet article a éte moissonné depuis la source Math-Net.Ru

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It is shown that an asymptotic solution of the wave equation concentrated near a bicharacteristic is most conveniently constructed in a Euclidean coordinate system whose origin moves along the bicharacteristic. 
@article{ZNSL_1984_140_a6,
     author = {A. P. Katchalov},
     title = {A coordinate system for describing the {\textquotedblleft}quasiphoton{\textquotedblright}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {73--76},
     year = {1984},
     volume = {140},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a6/}
}
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A. P. Katchalov. A coordinate system for describing the “quasiphoton”. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 14, Tome 140 (1984), pp. 73-76. http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a6/