@article{AIF_1971__21_3_83_0,
     author = {Lehmann, Daniel},
     title = {Sur les obstructions \`a l{\textquoteright}int\'egrabilit\'e des $G$-structures},
     journal = {Annales de l'Institut Fourier},
     pages = {83--93},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {21},
     number = {3},
     year = {1971},
     doi = {10.5802/aif.379},
     mrnumber = {49 #3751},
     zbl = {0222.53034},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.379/}
}