@book{35689,
	author = {Berti, Massimiliano. and SpringerLink (Online service)},
	title = {Nonlinear Oscillations of Hamiltonian PDEs},
	publisher = {Birkhäuser Boston,},
	year = {2007.},
	series = {Progress in Nonlinear Differential Equations and Their Applications ;},
	address = {Boston, MA :},
	url = {http://dx.doi.org/10.1007/978-0-8176-4681-3}
}