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. Periodic Solutions of Second-Order Differential Equations in Hilbert Spaces. [Internet]. 2021 ;18(5):223. Available from: https://doi.org/10.1007/s00009-021-01857-8
. Periodic solutions of nearly integrable Hamiltonian systems bifurcating from infinite-dimensional tori. NONLINEAR ANALYSIS [Internet]. 2020 . Available from: https://doi.org/10.1016/j.na.2019.111720