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@article{JRAM_1988__391_153074, author = {Thomas Bartsch}, title = {A global index for bifurcation of fixed points.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {181--197}, publisher = {mathdoc}, volume = {391}, year = {1988}, zbl = {0646.47041}, url = {http://geodesic.mathdoc.fr/item/JRAM_1988__391_153074/} }
Thomas Bartsch. A global index for bifurcation of fixed points.. Journal für die reine und angewandte Mathematik, Tome 391 (1988), pp. 181-197. http://geodesic.mathdoc.fr/item/JRAM_1988__391_153074/