Geodesic
On the nonlinear analogue of the WKB method and the method of the averaged lagrangian. II
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 13, Tome 128 (1983), pp. 95-101 Cet article a éte moissonné depuis la source Math-Net.Ru

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The article is a straight continuation of the previous one [2]. It deals with the problem of the unique solvability of high order equations for WKВ approximation and some relations of this problem with the properties of the averaged lagrangian. 
@article{ZNSL_1983_128_a9,
     author = {Ya. V. Kurylev},
     title = {On the nonlinear analogue of the {WKB} method and the method of the averaged {lagrangian.~II}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {95--101},
     year = {1983},
     volume = {128},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_128_a9/}
}
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Ya. V. Kurylev. On the nonlinear analogue of the WKB method and the method of the averaged lagrangian. II. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 13, Tome 128 (1983), pp. 95-101. http://geodesic.mathdoc.fr/item/ZNSL_1983_128_a9/