Interaction of a free wave with a semicrystal
Journées équations aux dérivées partielles (1995), article no. 19, 8 p. 
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     author = {Karpeshina, Yu.E.},
     title = {Interaction of a free wave with a semicrystal},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
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     pages = {1--8},
     publisher = {Ecole polytechnique},
     year = {1995},
     language = {en},
     url = {http://archive.numdam.org/item/JEDP_1995____A19_0/}
}
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Karpeshina, Yu.E. Interaction of a free wave with a semicrystal. Journées équations aux dérivées partielles (1995), article  no. 19, 8 p. http://archive.numdam.org/item/JEDP_1995____A19_0/

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[2] Yu. E. Karpeshina, Analytic perturbation theory for a periodic potential, Izv. Akad. Nauk SSSR Ser. Mat. 53 (1989), 45-65 ; English transl. in Math. USSR Izv. 34 (1990). | Zbl

[3] Yu. E. Karpeshina, Perturbation theory for the Schrödinger operator with a periodic potential, Proceedings of the Steklov Institute of Mathematics, 1991, Issue 3, 109-145. | Zbl