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@article{Authenticus:P-004-N2R, title = {{Spectral refinement for clustered eigenvalues of quasi-diagonal matrices}}, author = {M Ahues and FD d'Almeida and A Largillier and PB Vasconcelos}, doi = {10.1016/j.laa.2005.03.004}, journal = {Linear Algebra and Its Applications}, number = {2-3}, pages = {394-402}, publisher = {Elsevier Science Inc}, type = {Article}, volume = {413}, year = {2006} }