@article{JRAM_1985__358_152725,
     author = {Hansj\"org Kielh\"ofer},
     title = {Multiple eigenvalue bifurcation for {Fredholm} operators.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {104--124},
     publisher = {mathdoc},
     volume = {358},
     year = {1985},
     zbl = {0552.47025},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1985__358_152725/}
}