Geodesic
On the essential spectrum of a~four-particle Schr\"odinger operator on a~lattice
Matematičeskie trudy, Tome 13 (2010) no. 1, pp. 169-185.

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The Hamiltonian of a system of four arbitrary quantum particles with three-particle short-range interaction potentials on a three-dimensional lattice is examined. The location of the essential spectrum of this Hamiltonian is described by Faddeev's equations. 
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M. I. Muminov; U. R. Shodiev. On the essential spectrum of a~four-particle Schr\"odinger operator on a~lattice. Matematičeskie trudy, Tome 13 (2010) no. 1, pp. 169-185. http://geodesic.mathdoc.fr/item/MT_2010_13_1_a7/

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