Geodesic
Two-parameter asymptotic formulas for space-time Gaussian beams in an elastic media
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 18, Tome 173 (1988), pp. 87-95

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Asimptotic formulas with two small parameters for longitudinal and transverse space-time Gaussian beams are constructed. 
@article{ZNSL_1988_173_a6,
     author = {A. P. Katchalov},
     title = {Two-parameter asymptotic formulas for space-time {Gaussian} beams in an elastic media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {87--95},
     publisher = {mathdoc},
     volume = {173},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_173_a6/}
}
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A. P. Katchalov. Two-parameter asymptotic formulas for space-time Gaussian beams in an elastic media. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 18, Tome 173 (1988), pp. 87-95. http://geodesic.mathdoc.fr/item/ZNSL_1988_173_a6/