@article{NUMA_1971__17_132080,
     author = {F. CHATELIN-LABORDE},
     title = {Perturbation d'une matrice hermitienne ou normale.},
     journal = {Numerische Mathematik},
     pages = {318--337},
     publisher = {mathdoc},
     volume = {17},
     year = {1971},
     zbl = {0221.65072},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1971__17_132080/}
}