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Supported by Ministero P.I. Gruppo Nazionale “Calcolo delle Variazioni” (40%)
Supported by a CNR scholarship.
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Ambrosetti, A., Zelati, V.C. Perturbation of hamiltonian systems with Keplerian potentials. Math Z 201, 227–242 (1989). https://doi.org/10.1007/BF01160679
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DOI: https://doi.org/10.1007/BF01160679