@article {2011,
	title = {On the number of eigenvalues of a model operator related to a system of three particles on lattices},
	journal = {J. Phys. A 44 (2011) 315302},
	year = {2011},
	publisher = {IOP Publishing},
	doi = {10.1088/1751-8113/44/31/315302},
	url = {http://hdl.handle.net/1963/5496},
	author = {Gianfausto Dell{\textquoteright}Antonio and Zahriddin I. Muminov and Y.M. Shermatova}
}
