@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}, volume = {38}, number = {1}, year = {1988}, doi = {10.5802/aif.1130}, zbl = {0596.57018}, mrnumber = {89j:57023}, language = {fr}, url = {http://archive.numdam.org/articles/10.5802/aif.1130/} }