@article{AIF_1990__40_3_709_0,
     author = {Godbillon, Claude},
     title = {Une construction nouvelle des classes caract\'eristiques des feuilletages},
     journal = {Annales de l'Institut Fourier},
     pages = {709--721},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {40},
     number = {3},
     year = {1990},
     doi = {10.5802/aif.1230},
     mrnumber = {92b:57038},
     zbl = {0807.57024},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.1230/}
}