MathSciNet bibliographic data MR1733536 (2000i:15036) 15A48 Laffey, Thomas J.; Meehan, Eleanor A characterization of trace zero nonnegative $5\times 5$$5\times 5$ matrices. Special issue dedicated to Hans Schneider (Madison, WI, 1998). Linear Algebra Appl. 302/303 (1999), 295–302. Article

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