@article{01883743,
title = {Properness and topological degree for general elliptic operators.},
journal = {Abstract and Applied Analysis},
volume = {2003},
year = {2003},
pages = {129-181},
doi = {10.1155/S1085337503204073},
zbl = {1030.35038},
language = {en},
url = {http://dml.mathdoc.fr/item/01883743}
}
Volpert, V.; Volpert, A. Properness and topological degree for general elliptic operators.. Abstract and Applied Analysis, Tome 2003 (2003) pp. 129-181. doi : 10.1155/S1085337503204073. http://gdmltest.u-ga.fr/item/01883743/