Geodesic
Stark--Wannier ladders and cubic exponential sums
Funkcionalʹnyj analiz i ego priloženiâ, Tome 50 (2016) no. 3, pp. 81-85.

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Given a one-dimensional Stark–Wannier operator, we study the reflection coefficient and its poles in the lower half of the complex plane far from the real axis. In particular, the reflection coefficient is described asymptotically in terms of regularized infinite cubic exponential sums.
Keywords: Stark–Wannier ladders, cubic exponential sums. 
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F. Klopp; A. A. Fedotov. Stark--Wannier ladders and cubic exponential sums. Funkcionalʹnyj analiz i ego priloženiâ, Tome 50 (2016) no. 3, pp. 81-85. http://geodesic.mathdoc.fr/item/FAA_2016_50_3_a7/

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