@article{02236268, title = {Simplicity and stability of the first eigenvalue of a nonlinear elliptic system.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2005}, year = {2005}, pages = {1555-1563}, doi = {10.1155/IJMMS.2005.1555}, zbl = {1152.35368}, language = {en}, url = {http://dml.mathdoc.fr/item/02236268} }
El Khalil, Abdelouahed; El Manouni, Said; Ouanan, Mohammed. Simplicity and stability of the first eigenvalue of a nonlinear elliptic system.. International Journal of Mathematics and Mathematical Sciences, Tome 2005 (2005) pp. 1555-1563. doi : 10.1155/IJMMS.2005.1555. http://gdmltest.u-ga.fr/item/02236268/