@article{CMUC_1977_18_4_a6,
     author = {Hahn, Siegfried},
     title = {Gebietsinvarianzsatz und {Eigenwertaussagen} f\"ur konzentrierende {Abbildungen}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {697--713},
     year = {1977},
     volume = {18},
     number = {4},
     mrnumber = {0474385},
     zbl = {0375.47029},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977_18_4_a6/}
}