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Rasulov, Tulkin; Tretter, Christiane
(2018).
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Spectral inclusion for unbounded diagonally dominant n × n operator matrices.
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Rocky Mountain journal of mathematics, 48(1), pp. 279-324.
Rocky Mountain Mathematics Consortium
10.1216/RMJ-2018-48-1-279

Rasulov, T. Kh.
(2011).
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Essential spectrum of a model operator associated with a three-particle system on a lattice.
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Theoretical and mathematical physics, 166(1), pp. 81-93.
Springer
10.1007/s11232-011-0007-0