@article {2008,
	title = {Forced Vibrations of a Nonhomogeneous String},
	journal = {SIAM J. Math. Anal. 40 (2008) 382-412},
	number = {SISSA;36/2006/M},
	year = {2008},
	abstract = {We prove existence of vibrations of a nonhomogeneous string under a nonlinear time periodic forcing term in the case in which the forcing frequency avoids resonances with the vibration modes of the string (nonresonant case). The proof relies on a Lyapunov-Schmidt reduction and a Nash-Moser iteration scheme.},
	doi = {10.1137/060665038},
	url = {http://hdl.handle.net/1963/2643},
	author = {P Baldi and Massimiliano Berti}
}
