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MR1126533
(93c:81044)
81Q15
(47A55)
Karpeshina, Yu. E. Geometrical background for the perturbation theory of the polyharmonic operator with periodic potentials. Topological phases in quantum theory (Dubna, 1988), 251--276, World Sci. Publ., Teaneck, NJ, 1989. |
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