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Construction of the Essential Spectrum for a Multidimensional Non-self-adjoint Schrödinger Operator via the Spectra of Operators with Periodic Potentials, I Leonid Zelenko Research article Pages: 11 - 68
Construction of the Essential Spectrum for a Multidimensional Non-self-adjoint Schrödinger Operator via the Spectra of Operators with Periodic Potentials, II Leonid Zelenko Research article Pages: 69 - 124