@article{CRMATH_2004__339_9_625_0,
     author = {Kammerer-Colin de Verdi\`ere, Mathilde},
     title = {Stable products of spheres in the non-linear coupling of oscillators or quasi-periodic motions},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {625--629},
     publisher = {Elsevier},
     volume = {339},
     number = {9},
     year = {2004},
     doi = {10.1016/j.crma.2004.09.017},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2004.09.017/}
}