Geodesic
Space-time ray method and quasiphotons
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 36, Tome 342 (2007), pp. 5-13

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A new approach to the construction of qusiphotons is illustrated by example of quasiphotons of the wave equation with variable velocity. 
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     author = {V. M. Babich},
     title = {Space-time ray method and quasiphotons},
     journal = {Zapiski Nauchnykh Seminarov POMI},
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     volume = {342},
     year = {2007},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_2007_342_a0/}
}
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V. M. Babich. Space-time ray method and quasiphotons. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 36, Tome 342 (2007), pp. 5-13. http://geodesic.mathdoc.fr/item/ZNSL_2007_342_a0/