@article{JCA_2009_16_3_JCA_2009_16_3_a25,
     author = {B. Ricceri},
     title = {A {Multiplicity} {Theorem} in {R\protect\textsuperscript{n}}},
     journal = {Journal of convex analysis},
     pages = {987--992},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2009},
     url = {http://geodesic.mathdoc.fr/item/JCA_2009_16_3_JCA_2009_16_3_a25/}
}