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@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/} }
Hansjörg Kielhöfer. Multiple eigenvalue bifurcation for Fredholm operators.. Journal für die reine und angewandte Mathematik, Tome 358 (1985), pp. 104-124. http://geodesic.mathdoc.fr/item/JRAM_1985__358_152725/