References
Fan, Ky: Note on circular disks containing the eigenvalues of a matrix. Duke Math. J.25, 441–445 (1958).
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This document is based on work performed at the Computing Technology Center operated by Union Carbide Corporation for the U.S. Atomic Energy Commission.
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Stewart, G.W. A generalization of a theorem of fan on gershgorin disks. Numer. Math. 10, 162 (1967). https://doi.org/10.1007/BF02174149
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DOI: https://doi.org/10.1007/BF02174149