@article{AIF_2009__59_3_951_0,
     author = {Rib\'on, Javier},
     title = {Non-embeddability of general unipotent diffeomorphisms up to formal conjugacy},
     journal = {Annales de l'Institut Fourier},
     pages = {951--975},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {59},
     number = {3},
     year = {2009},
     doi = {10.5802/aif.2453},
     zbl = {1186.37057},
     mrnumber = {2543658},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2453/}
}