1. S. Albeverio, S. N. Lakaev, and Z. I. Muminov, “On the number of eigenvalues of a model operator associated to a system of three-particles on lattices,” Russian J. Math. Phys. 14(4), 377–387 (2007).
2. Yu. Kh. Eshkabilov, “Two electrons in the Hubbert model with admixture. Triplicate state,” Deposited by the Uzbekistan State Scientific Foundation on 08. 07. 1994, №2148-Uz94.
3. Yu. Kh. Eshkabilov, “A discrete three-particle Schrödinger operator in the Hubbard model,” Teoret. i Mat. Fiz. 149(2), 228–243 (2006) [Theoret. and Math. Phys. 149 (2), 1497–1511 (2006)].
4. Yu. Kh. Eshkabilov, “Partially bounded operators with bounded kernels,” Matemat. Trudy 11(1), 192–207 (2008) [Siberian Adv. Math. 19 (3), 151–161].
5. Yu. Kh. Eshkabilov, “The Efimov effect for a model three-particle discrete Schrödinger operator,” Teoret. i Matem. Fiz. 164(1), 78–87 (2010) [Theor. and Math. Phyz. 164 (1), 896–904 (2010)].