@article{JEP_2022__9__681_0,
     author = {Bernier, Joackim and Gr\'ebert, Beno{\^\i}t},
     title = {Birkhoff normal forms for {Hamiltonian} {PDEs} in their energy space},
     journal = {Journal de l{\textquoteright}\'Ecole polytechnique {\textemdash} Math\'ematiques},
     pages = {681--745},
     publisher = {Ecole polytechnique},
     volume = {9},
     year = {2022},
     doi = {10.5802/jep.193},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/jep.193/}
}