@article{ETNA_2008__31__a5,
     author = {Schwetlick, Hubert and Schreiber, Kathrin},
     title = {A counterexample for characterizing an invariant subspace of a matrix},
     journal = {Electronic transactions on numerical analysis},
     pages = {295--305},
     publisher = {mathdoc},
     volume = {31},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2008__31__a5/}
}