@article{MAN_1973__203_162442,
     author = {Hansj\"org Linden},
     title = {\"Uber die {Stabilit\"at} von {Eigenwerten.}},
     journal = {Mathematische Annalen},
     pages = {215--220},
     publisher = {mathdoc},
     volume = {203},
     year = {1973},
     zbl = {0242.47009},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__203_162442/}
}