@article{CRMATH_2006__342_5_301_0,
     author = {Marc Chaperon and Mathilde Kammerer-Colin De Verdi\`ere and Santiago L\'opez De Medrano},
     title = {More compact invariant manifolds appearing in the non-linear coupling of oscillators},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {301--305},
     publisher = {Elsevier},
     volume = {342},
     number = {5},
     year = {2006},
     doi = {10.1016/j.crma.2005.12.032},
     language = {en},
}