@article{NUMA_1970__15_131973,
     author = {A. RUHE},
     title = {Properties of a {Matrix} with a {Very} {Ill-conditioned} {Eigenproblem.}},
     journal = {Numerische Mathematik},
     pages = {57--60},
     publisher = {mathdoc},
     volume = {15},
     year = {1970},
     zbl = {0184.37704},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1970__15_131973/}
}