@article {2020,
	title = {Periodic solutions of nearly integrable Hamiltonian systems bifurcating from infinite-dimensional tori},
	journal = {NONLINEAR ANALYSIS},
	year = {2020},
	abstract = {<p><span style="color: $\#$2e2e2e; font-family: NexusSerif, Georgia, {\textquoteright}Times New Roman{\textquoteright}, Times, STIXGeneral, {\textquoteright}Cambria Math{\textquoteright}, {\textquoteright}Lucida Sans Unicode{\textquoteright}, {\textquoteright}Microsoft Sans Serif{\textquoteright}, {\textquoteright}Segoe UI Symbol{\textquoteright}, {\textquoteright}Arial Unicode MS{\textquoteright}, serif; font-size: 18px;">We prove the existence of periodic solutions of some infinite-dimensional nearly integrable Hamiltonian systems, bifurcating from infinite-dimensional tori, by the use of a generalization of the Poincar{\'e}{\textendash}Birkhoff Theorem.</span></p>},
	issn = {0362-546X},
	doi = {10.1016/j.na.2019.111720},
	url = {https://doi.org/10.1016/j.na.2019.111720},
	author = {Alessandro Fonda and Giuliano Klun and Andrea Sfecci}
}
