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Communicated by H. Brezis
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Ambrosetti, A., Zelati, V.C. Closed orbits of fixed energy for singular Hamiltonian systems. Arch. Rational Mech. Anal. 112, 339–362 (1990). https://doi.org/10.1007/BF02384078
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DOI: https://doi.org/10.1007/BF02384078