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106 THOMAS LAFFEY AND HELENA SˇMIGOC
[23] Guo Wuwen, Eigenvalues of nonnegative matrices, Linear Algebra Appl. 266 (1997), 261–270.
School of Mathematical Sciences University College Dublin Belfield
Dublin 4, Ireland
E-mail address: Thomas.Laffey@ucd.ie, Helena.Smigoc@fmf.uni-lj.si
