Addendum to Closed orbits of fixed energy for a class of N-body problems

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A. Ambrosetti, V. Coti Zelati, Addendum to Closed orbits of fixed energy for a class of N-body problems. Ann. Inst. H. Poincaré Anal. Non Linéaire 9 (1992), no. 3, pp. 337–338

DOI 10.1016/S0294-1449(16)30241-4