@article{01929991, title = {Birkhoff-Kellogg theorems on invariant directions for multimaps.}, journal = {Abstract and Applied Analysis}, volume = {2003}, year = {2003}, pages = {435-448}, doi = {10.1155/S1085337503205030}, zbl = {1045.47040}, language = {en}, url = {http://dml.mathdoc.fr/item/01929991} }
Agarwal, Ravi P.; O'Regan, Donal. Birkhoff-Kellogg theorems on invariant directions for multimaps.. Abstract and Applied Analysis, Tome 2003 (2003) pp. 435-448. doi : 10.1155/S1085337503205030. http://gdmltest.u-ga.fr/item/01929991/