@article{GDZPPN002206005,
title = {A global index for bifurcation of fixed points.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {390},
year = {1988},
pages = {181-197},
zbl = {0646.47041},
url = {http://dml.mathdoc.fr/item/GDZPPN002206005}
}
Bartsch, Thomas. A global index for bifurcation of fixed points.. Journal für die reine und angewandte Mathematik, Tome 390 (1988) pp. 181-197. http://gdmltest.u-ga.fr/item/GDZPPN002206005/