@article{NUMA_1984__44_132918,
     author = {G.W. Stewart},
     title = {On the {Invariance} of {Perturbed} {Null} {Vectors} {Under} {Column} {Scaling.}},
     journal = {Numerische Mathematik},
     pages = {61--66},
     year = {1984},
     volume = {44},
     zbl = {0579.65033},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1984__44_132918/}
}