@article{10_4064_ap104_3_4,
     author = {Shapour Heidarkhani and Yu Tian and Chun-Lei Tang},
     title = {Existence of three solutions for a class of
$(p_1,\ldots,p_n)$-biharmonic systems
 with {Navier} boundary conditions},
     journal = {Annales Polonici Mathematici},
     pages = {261--277},
     publisher = {mathdoc},
     volume = {104},
     number = {3},
     year = {2012},
     doi = {10.4064/ap104-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap104-3-4/}
}