@article{GDZPPN002299542,
title = {Homotopy Properties of Semi-Fredholm Operators in Banach Spaces.},
journal = {Mathematische Annalen},
volume = {179},
year = {1968},
pages = {273-301},
zbl = {0163.37602},
url = {http://dml.mathdoc.fr/item/GDZPPN002299542}
}
NEUBAUER, G. Homotopy Properties of Semi-Fredholm Operators in Banach Spaces.. Mathematische Annalen, Tome 179 (1968) pp. 273-301. http://gdmltest.u-ga.fr/item/GDZPPN002299542/