@article{AIF_2008__58_5_1407_0,
     author = {Host, Bernard and Kra, Bryna},
     title = {Analysis of two step nilsequences},
     journal = {Annales de l'Institut Fourier},
     pages = {1407--1453},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {58},
     number = {5},
     year = {2008},
     doi = {10.5802/aif.2389},
     zbl = {1145.37006},
     mrnumber = {2445824},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2389/}
}