@article{EJDE_2010__2010__a200,
     author = {da Silva,  Edcarlos D.},
     title = {Multiplicity of solutions for gradient systems},
     journal = {Electronic journal of differential equations},
     year = {2010},
     volume = {2010},
     zbl = {1187.35062},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a200/}
}