@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/}
}