@article{AIF_2011__61_5_2077_0,
     author = {Langer, Adrian},
     title = {On the {S-fundamental} group scheme},
     journal = {Annales de l'Institut Fourier},
     pages = {2077--2119},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {61},
     number = {5},
     year = {2011},
     doi = {10.5802/aif.2667},
     zbl = {1247.14019},
     mrnumber = {2961849},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.2667/}
}