Geodesic
Adiabatic perturbation of periodic potential. II
Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 3, pp. 430-442 
V. S. Buslaev; L. A. Dmitrieva. Adiabatic perturbation of periodic potential. II. Teoretičeskaâ i matematičeskaâ fizika, Tome 73 (1987) no. 3, pp. 430-442. http://geodesic.mathdoc.fr/item/TMF_1987_73_3_a8/
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Voir la notice de l'article provenant de la source Math-Net.Ru

For the equation $-\psi'' +p(x)\psi +q(\varepsilon x)\psi=0$, $p$ – periodic function, $\varepsilon\to 0$), behaviour of solutions in neighbourhood of two close turning points is studied. The results give mathematically consistent description of the electric breakdown effect in the Block electron theory.

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