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Rasulov, Tulkin; Tretter, Christiane (2018). Spectral inclusion for unbounded diagonally dominant n × n operator matrices. 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). Essential spectrum of a model operator associated with a three-particle system on a lattice. Theoretical and mathematical physics, 166(1), pp. 81-93. Springer 10.1007/s11232-011-0007-0
