Geodesic
Difference Operators on Two-Dimensional Regular Lattices
Teoretičeskaâ i matematičeskaâ fizika, Tome 127 (2001) no. 1, pp. 34-46
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We solve the direct and inverse spectral problems for two classes of difference operators. We present systems of ordinary differential equations describing isospectral deformations of these operators. 
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A. A. Oblomkov. Difference Operators on Two-Dimensional Regular Lattices. Teoretičeskaâ i matematičeskaâ fizika, Tome 127 (2001) no. 1, pp. 34-46. http://geodesic.mathdoc.fr/item/TMF_2001_127_1_a2/

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