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A Bloch electron in an external field. (English. Russian original) Zbl 0726.34070
Leningr. Math. J. 1, No. 2, 287-320 (1990); translation from Algebra Anal. 1, No. 2, 1-29 (1989).
See the review in Zbl 0714.34128.

MSC:
34L25 Scattering theory, inverse scattering involving ordinary differential operators
81U30 Dispersion theory, dispersion relations arising in quantum theory
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