%0 Journal Article %A Shapour Heidarkhani %A Yu Tian %A Chun-Lei Tang %T Existence of three solutions for a class of $(p_1,\ldots,p_n)$-biharmonic systems with Navier boundary conditions %J Annales Polonici Mathematici %D 2012 %P 261-277 %V 104 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap104-3-4/ %R 10.4064/ap104-3-4 %G en %F 10_4064_ap104_3_4