Geodesic
Computation of eigenvalues of perturbed discrete semibounded operators
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 46 (2006) no. 7, pp. 1265-1272

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To compute the eigenvalues of a perturbed discrete semibounded operator, systems are obtained for the first time in which the number of equations is equal to the multiplicity of the corresponding eigenvalues of the unperturbed operator. 
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     title = {Computation of eigenvalues of perturbed discrete semibounded operators},
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S. I. Kadchenko; I. I. Kinzina. Computation of eigenvalues of perturbed discrete semibounded operators. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 46 (2006) no. 7, pp. 1265-1272. http://geodesic.mathdoc.fr/item/ZVMMF_2006_46_7_a10/