%0 Journal Article %A Schwetlick, Hubert %A Schreiber, Kathrin %T A counterexample for characterizing an invariant subspace of a matrix %J Electronic transactions on numerical analysis %D 2008 %P 295-305 %V 31 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2008__31__a5/ %G en %F ETNA_2008__31__a5