Literature Cited
T. Kato, Perturbation Theory for Linear Operators, Springer, Berlin (1966).
A. A. Arsen'ev, Singular Potentials and Resonances [in Russian], Izd-vo MGU (1974).
Additional information
M. V. Lomonosov Moscow State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 23, No. 3, pp. 418–420, June, 1975.
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Arsen'ev, A.A. Note on estimating the width of lower energy bands in a periodic potential. Theor Math Phys 23, 615–616 (1975). https://doi.org/10.1007/BF01041683
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DOI: https://doi.org/10.1007/BF01041683