@article{EJDE_2013__2013__a136,
     author = {Ferrara,  Massimiliano and Guerrini,  Luca and Zhang,  Binlin},
     title = {Multiple solutions for perturbed non-local fractional {Laplacian} equations},
     journal = {Electronic journal of differential equations},
     year = {2013},
     volume = {2013},
     zbl = {1290.35309},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a136/}
}