no. 6
The minimal period problem of classical hamiltonian systems with even potentials
Annales de l'I.H.P. Analyse non linéaire, Tome 10 (1993) no. 6, pp. 605-626. 
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     author = {Long, Yiming},
     title = {The minimal period problem of classical hamiltonian systems with even potentials},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {605--626},
     publisher = {Gauthier-Villars},
     volume = {10},
     number = {6},
     year = {1993},
     mrnumber = {1253604},
     zbl = {0804.58018},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1993__10_6_605_0/}
}
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Long, Yiming. The minimal period problem of classical hamiltonian systems with even potentials. Annales de l'I.H.P. Analyse non linéaire, Tome 10 (1993) no. 6, pp. 605-626. http://archive.numdam.org/item/AIHPC_1993__10_6_605_0/

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