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The work of the second author has been supported in part by NSF Grant MCS-8104242.
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Bahri, A., Berestycki, H. Forced vibrations of superquadratic Hamiltonian systems. Acta Math 152, 143–197 (1984). https://doi.org/10.1007/BF02392196
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DOI: https://doi.org/10.1007/BF02392196