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Supported by a CNR scholarship. Permanent address: S.I.S.S.A., strada Costiera 11, I-34014 Trieste, Italy
Supported by U.S. Army contract DAJA 45-88-C-0009
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Zelati, V.C., Ekeland, I. & Séré, E. A variational approach to homoclinic orbits in Hamiltonian systems. Math. Ann. 288, 133–160 (1990). https://doi.org/10.1007/BF01444526
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DOI: https://doi.org/10.1007/BF01444526