Finding of the saddle point for the ease of an ellipses
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 3, Tome 17 (1970), pp. 20-24

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     author = {V. M. Babich},
     title = {Finding of the saddle point for the ease of an ellipses},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {20--24},
     publisher = {mathdoc},
     volume = {17},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1970_17_a2/}
}
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V. M. Babich. Finding of the saddle point for the ease of an ellipses. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 3, Tome 17 (1970), pp. 20-24. http://geodesic.mathdoc.fr/item/ZNSL_1970_17_a2/