Geodesic
Remark on the spectrum structure of the two-dimensional Schr\"odinger operator with the periodic potential
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part IV, Tome 109 (1981), pp. 131-133

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In the remark it is shown that it is possible to omit arithmetical conditions on the period-lattice of the potential in the Schrödinger operator, which were assumed in the previous works of the second author. 
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     author = {V. N. Popov and M. M. Skriganov},
     title = {Remark on the spectrum structure of the two-dimensional {Schr\"odinger} operator with the periodic potential},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {131--133},
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     volume = {109},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_109_a5/}
}
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V. N. Popov; M. M. Skriganov. Remark on the spectrum structure of the two-dimensional Schr\"odinger operator with the periodic potential. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part IV, Tome 109 (1981), pp. 131-133. http://geodesic.mathdoc.fr/item/ZNSL_1981_109_a5/