%0 Journal Article %A Afrouzi, Ghasem A. %A Mirzapour, Maryam %A Zhang, Qihu %T Simplicity and stability of the first eigenvalue of a $(p;q)$ Laplacian system %J Electronic Journal of Differential Equations %D 2012 %V 2012 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a28/ %G en %F EJDE_2012__2012__a28