@article{EJDE_1999__1999__a33,
     author = {Squassina,  Marco},
     title = {Existence of multiple solutions for quasilinear diagonal elliptic systems},
     journal = {Electronic journal of differential equations},
     year = {1999},
     volume = {1999},
     zbl = {0921.35052},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1999__1999__a33/}
}