Matrix second-order differential equations and hamiltonian systems of quartic type
Annales de l'I.H.P. Physique théorique, Tome 50 (1989) no. 3, pp. 369-375. 
@article{AIHPA_1989__50_3_369_0,
     author = {Fran\c{c}oise, J. P. and Ragnisco, O.},
     title = {Matrix second-order differential equations and hamiltonian systems of quartic type},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {369--375},
     publisher = {Gauthier-Villars},
     volume = {50},
     number = {3},
     year = {1989},
     mrnumber = {1017970},
     zbl = {0695.58012},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1989__50_3_369_0/}
}
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Françoise, J. P.; Ragnisco, O. Matrix second-order differential equations and hamiltonian systems of quartic type. Annales de l'I.H.P. Physique théorique, Tome 50 (1989) no. 3, pp. 369-375. http://archive.numdam.org/item/AIHPA_1989__50_3_369_0/

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