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@article{JRAM_1990__409_153246, author = {Charles A. Stuart and T. K\"upper}, title = {Bifurcation into gaps in the essential spectrum.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {1--34}, publisher = {mathdoc}, volume = {409}, year = {1990}, zbl = {0697.47063}, url = {http://geodesic.mathdoc.fr/item/JRAM_1990__409_153246/} }
Charles A. Stuart; T. Küpper. Bifurcation into gaps in the essential spectrum.. Journal für die reine und angewandte Mathematik, Tome 409 (1990), pp. 1-34. http://geodesic.mathdoc.fr/item/JRAM_1990__409_153246/