@article{GDZPPN002414236,
title = {On the Uniqueness of the Topological Degree for k-Set-Contractions.},
journal = {Mathematische Zeitschrift},
volume = {136},
year = {1974},
pages = {1-6},
zbl = {0268.55009},
url = {http://dml.mathdoc.fr/item/GDZPPN002414236}
}
Nussbaum, Roger D. On the Uniqueness of the Topological Degree for k-Set-Contractions.. Mathematische Zeitschrift, Tome 136 (1974) pp. 1-6. http://gdmltest.u-ga.fr/item/GDZPPN002414236/