Geodesic
Space-time ray method for whispering gallery waves
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 51, Tome 506 (2021), pp. 15-20

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The work is devoted to the mathematical description of the whispering gallery waves modulated by amplitude and frequency. Space-time ray method for this problem is introduced. 
@article{ZNSL_2021_506_a2,
     author = {V. M. Babich},
     title = {Space-time ray method for whispering gallery waves},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {15--20},
     publisher = {mathdoc},
     volume = {506},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2021_506_a2/}
}
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V. M. Babich. Space-time ray method for whispering gallery waves. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 51, Tome 506 (2021), pp. 15-20. http://geodesic.mathdoc.fr/item/ZNSL_2021_506_a2/