@article{CRMATH_2004__338_7_565_0,
     author = {Grabsi, F\'ethi and Montaldi, James and Ortega, Juan-Pablo},
     title = {Bifurcation and forced symmetry breaking in {Hamiltonian} systems},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {565--570},
     publisher = {Elsevier},
     volume = {338},
     number = {7},
     year = {2004},
     doi = {10.1016/j.crma.2004.01.029},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.01.029/}
}