@article{JCA_2014_21_1_JCA_2014_21_1_a2,
     author = {G. Barletta and P. Candito and D. Motreanu},
     title = {Constant {Sign} and {Sign-Changing} {Solutions} for {Quasilinear} {Elliptic} {Equations} with {Neumann} {Boundary} {Condition}},
     journal = {Journal of convex analysis},
     pages = {53--66},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/JCA_2014_21_1_JCA_2014_21_1_a2/}
}