@article{AIF_2014__64_6_2265_0,
     author = {Le Donne, Enrico and Ottazzi, Alessandro and Warhurst, Ben},
     title = {Ultrarigid tangents of {sub-Riemannian} nilpotent groups},
     journal = {Annales de l'Institut Fourier},
     pages = {2265--2282},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {64},
     number = {6},
     year = {2014},
     doi = {10.5802/aif.2912},
     zbl = {06387339},
     mrnumber = {3331166},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.2912/}
}