no. 1
Nontrivial periodic solutions for strong resonance hamiltonian systems
Annales de l'I.H.P. Analyse non linéaire, Tome 14 (1997) no. 1, pp. 103-117 
@article{AIHPC_1997__14_1_103_0,
     author = {Chang, K. C. and Liu, J. Q. and Liu, M. J.},
     title = {Nontrivial periodic solutions for strong resonance hamiltonian systems},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {103--117},
     year = {1997},
     publisher = {Gauthier-Villars},
     volume = {14},
     number = {1},
     mrnumber = {1437190},
     zbl = {0881.34061},
     language = {en},
     url = {https://www.numdam.org/item/AIHPC_1997__14_1_103_0/}
}
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Chang, K. C.; Liu, J. Q.; Liu, M. J. Nontrivial periodic solutions for strong resonance hamiltonian systems. Annales de l'I.H.P. Analyse non linéaire, Tome 14 (1997) no. 1, pp. 103-117. https://www.numdam.org/item/AIHPC_1997__14_1_103_0/

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