Geodesic
Finiteness of the number of lacunae in the spectrum of the multidimensional polyharmonic operator with a~periodic potential
Sbornik. Mathematics, Tome 41 (1982) no. 1, pp. 115-125

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The spectrum of the multidimensional polyharmonic differential operator is investigated. The finiteness of the number of connected components of the spectrum is proved. Bibliography: 10 titles. 
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     author = {M. M. Skriganov},
     title = {Finiteness of the number of lacunae in the spectrum of the multidimensional polyharmonic operator with a~periodic potential},
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M. M. Skriganov. Finiteness of the number of lacunae in the spectrum of the multidimensional polyharmonic operator with a~periodic potential. Sbornik. Mathematics, Tome 41 (1982) no. 1, pp. 115-125. http://geodesic.mathdoc.fr/item/SM_1982_41_1_a6/