no. 2
Integrable dynamical systems obtained by duplication
Annales de l'I.H.P. Physique théorique, Tome 57 (1992) no. 2, pp. 167-181 
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     author = {Calogero, F. and Fran\c{c}oise, J.-P.},
     title = {Integrable dynamical systems obtained by duplication},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {167--181},
     year = {1992},
     publisher = {Gauthier-Villars},
     volume = {57},
     number = {2},
     mrnumber = {1184888},
     zbl = {0766.58028},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1992__57_2_167_0/}
}
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Calogero, F.; Françoise, J.-P. Integrable dynamical systems obtained by duplication. Annales de l'I.H.P. Physique théorique, Tome 57 (1992) no. 2, pp. 167-181. https://www.numdam.org/item/AIHPA_1992__57_2_167_0/

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