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ToAlston S. Householder on his sixtieth birthday.
The preparation of this paper was supported in part by the National Science Foundation. The results were announced at the Siam Matrix Symposium at Gatlinburg in April 1964.
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Todd, J. On smallest isolated gerschgorin disks for eigenvalues. Numer. Math. 7, 171–175 (1965). https://doi.org/10.1007/BF01397690
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DOI: https://doi.org/10.1007/BF01397690