@article{MTA_2017_2_2_a2,
     author = {Saeid Shokooh},
     title = {Multiplicity results for a non-homogeneous {Neumann} problem via a variational principle of {Ricceri}},
     journal = {Minimax theory and its applications},
     year = {2017},
     volume = {2},
     number = {2},
     zbl = {1376.35055},
     url = {http://geodesic.mathdoc.fr/item/MTA_2017_2_2_a2/}
}