@article{JEMS_2009_11_5_a3,
     author = {Andreas Henrici and Thomas Kappeler},
     title = {Resonant normal form for even periodic {FPU} chains},
     journal = {Journal of the European Mathematical Society},
     pages = {1025--1056},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {2009},
     doi = {10.4171/jems/174},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/174/}
}