@article{AIF_2006__56_4_851_0,
     author = {Duchemin, David},
     title = {Quaternionic contact structures in dimension $7$},
     journal = {Annales de l'Institut Fourier},
     pages = {851--885},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {56},
     number = {4},
     year = {2006},
     doi = {10.5802/aif.2203},
     zbl = {1122.53025},
     mrnumber = {2266881},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2203/}
}