@article{JCA_1995_2_1-2_a6,
     author = {A. Cellina and S. Perrotta},
     title = {On a {Problem} of {Potential} {Wells}},
     journal = {Journal of convex analysis},
     pages = {103--116},
     publisher = {mathdoc},
     volume = {2},
     number = {1-2},
     year = {1995},
     url = {http://geodesic.mathdoc.fr/item/JCA_1995_2_1-2_a6/}
}