@article{AIF_1988__38_1_205_0,
     author = {Raby, Gilles},
     title = {Invariance des classes de {Godbillon-Vey} par $C^1$-diff\'eomorphismes},
     journal = {Annales de l'Institut Fourier},
     pages = {205--213},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {38},
     number = {1},
     year = {1988},
     doi = {10.5802/aif.1130},
     mrnumber = {89j:57023},
     zbl = {0596.57018},
     language = {fr},
     url = {http://www.numdam.org/articles/10.5802/aif.1130/}
}