Geodesic
Summation of space-time Gaussian beams in problems of propagation of wave packets
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 143-158 Cet article a éte moissonné depuis la source Math-Net.Ru

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A method is presented for the calculation of wave packets in inhomogeneous media which permits one to overcome divergence at caustics. 
@article{ZNSL_1987_165_a13,
     author = {M. M. Popov},
     title = {Summation of space-time {Gaussian} beams in problems of propagation of wave packets},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {143--158},
     year = {1987},
     volume = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a13/}
}
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M. M. Popov. Summation of space-time Gaussian beams in problems of propagation of wave packets. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 143-158. http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a13/