@article{JCA_2013_20_4_JCA_2013_20_4_a10,
     author = {G. Bonanno and R. Livrea},
     title = {Existence and {Multiplicity} of {Periodic} {Solutions} for {Second} {Order} {Hamiltonian} {Systems} {Depending} on a {Parameter}},
     journal = {Journal of convex analysis},
     pages = {1075--1094},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/JCA_2013_20_4_JCA_2013_20_4_a10/}
}