A remark on two dimensional periodic potentials.
Commentarii mathematici Helvetici, Tome 57 (1982), pp. 130-134.

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Mots-clés : gaps of eigenvalues, periodic potential
@article{CMH_1982__57_139898,
     author = {E. Trubowitz and B.E.J. Dahlberg},
     title = {A remark on two dimensional periodic potentials.},
     journal = {Commentarii mathematici Helvetici},
     pages = {130--134},
     publisher = {mathdoc},
     volume = {57},
     year = {1982},
     zbl = {0539.35059},
     url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139898/}
}
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E. Trubowitz; B.E.J. Dahlberg. A remark on two dimensional periodic potentials.. Commentarii mathematici Helvetici, Tome 57 (1982), pp. 130-134. http://geodesic.mathdoc.fr/item/CMH_1982__57_139898/