On the Spectrum of a Class of Second Order Periodic Elliptic Differential Operators
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- Friedlander, L. Commun. Math. Phys. (2002) 229: 49. doi:10.1007/s00220-002-0675-6
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Under an additional symmetry condition, we prove that the spectrum of a second order self-adjoint elliptic differential operator with periodic coefficients is purely absolutely continuous.