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

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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. 
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     author = {A. P. Katchalov},
     title = {A coordinate system for describing the ``quasiphoton''},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {73--76},
     publisher = {mathdoc},
     volume = {140},
     year = {1984},
     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/