Geodesic
Finite-zone almost periodic solutions in WKB-approximations
Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 15 (1980), pp. 3-94.

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It is shown that the recently discovered finite-zone, almost-periodic solutions may, on the one hand, serve as the foundation for the development of the multiphase WKB method in nonlinear equations (the method of Whitham) and, on the other hand, serve to define Lagrangian manifolds with complex germs which can be (second) quantized in the quasiclassical approximation. 
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     author = {S. Yu. Dobrokhotov and V. P. Maslov},
     title = {Finite-zone almost periodic solutions in {WKB-approximations}},
     journal = {Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya},
     pages = {3--94},
     publisher = {mathdoc},
     volume = {15},
     year = {1980},
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     url = {http://geodesic.mathdoc.fr/item/INTD_1980_15_a0/}
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S. Yu. Dobrokhotov; V. P. Maslov. Finite-zone almost periodic solutions in WKB-approximations. Itogi Nauki i Tekhniki. Seriya Sovremennye Problemy Matematiki. Noveishie Dostizheniya, Tome 15 (1980), pp. 3-94. http://geodesic.mathdoc.fr/item/INTD_1980_15_a0/