Behaviour of the whispering gallery rays in a~vicinity of a~point where curvature of the boundary vanishes
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 146-155

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Behavior of whispering gallery rays in a vicinity of the boundary point $S=0$ with zero curvature is invertigated in two cases. In the first one boundary curvature $K$ is zero in this point, but $\frac{dK}{dS}\mid_{S=0}\ne0$. In the second one $K=\frac{dK}{dS}=0$ in the point $S=0$, but $\frac{d^2K}{dS^2}\ne0$. Results are obtained by the help of a computer and presented on the pictures.
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     author = {A. I. Lanin and M. M. Popov},
     title = {Behaviour of the whispering gallery rays in a~vicinity of a~point where curvature of the boundary vanishes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {146--155},
     publisher = {mathdoc},
     volume = {104},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a14/}
}
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A. I. Lanin; M. M. Popov. Behaviour of the whispering gallery rays in a~vicinity of a~point where curvature of the boundary vanishes. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 146-155. http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a14/