@article{oai:soar-ir.repo.nii.ac.jp:00018257,
 author = {Hiroshima,  Fumio and Sasaki,  Itaru and Shirai,  Tomoyuki and Suzuki,  Akito},
 issue = {2012B-4},
 journal = {Journal of Math-for-Industry},
 month = {},
 note = {The spectrum of discrete Schrödinger operator L + V on the d-dimensional lattice is considered, where L denotes the discrete Laplacian and V a delta function with mass at a single point. Eigenvalues of L + V are specified and the absence of singular continuous spectrum is proven. In particular it is shown that an embedded eigenvalue does appear for d ≥ 5 but does not for 1 ≤ d ≤ 4., Article, Journal of Math-for-Industry. 4(2012B-4):105-108 (2012)},
 pages = {105--108},
 title = {Note on the spectrum of discrete Schrodinger operators},
 volume = {4},
 year = {2012}
}