Geodesic
On complex ray solutions and eigenfunctions concentrated in a~neighbourhood of the closed geodesic
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 6-13

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A new method of obtaining of formulas for eigenfunctions, concentrated in a neighbourhood of the closed geodesic is proposed. The method is connected with V. P. Maslov technique (see [2]) and based on ray expansions with complex eiconal. 
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     author = {V. M. Babich and V. V. Ulin},
     title = {On complex ray solutions and eigenfunctions concentrated in a~neighbourhood of the closed geodesic},
     journal = {Zapiski Nauchnykh Seminarov POMI},
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     publisher = {mathdoc},
     volume = {104},
     year = {1981},
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     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a0/}
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V. M. Babich; V. V. Ulin. On complex ray solutions and eigenfunctions concentrated in a~neighbourhood of the closed geodesic. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 11, Tome 104 (1981), pp. 6-13. http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a0/