Geodesic
Tilted nonparaxial beams and packets for the wave equation with two spatial variables
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 41, Tome 393 (2011), pp. 224-233

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A class of relatively nondistorted solutions of the wave equation in two-dimension space is constructed. This class includes nonharmonic in time tilted beam-like and packetlike solutions with Gaussian-type localization. 
@article{ZNSL_2011_393_a15,
     author = {A. B. Plachenov},
     title = {Tilted nonparaxial beams and packets for the wave equation with two spatial variables},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {224--233},
     publisher = {mathdoc},
     volume = {393},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2011_393_a15/}
}
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A. B. Plachenov. Tilted nonparaxial beams and packets for the wave equation with two spatial variables. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 41, Tome 393 (2011), pp. 224-233. http://geodesic.mathdoc.fr/item/ZNSL_2011_393_a15/