@article{AIF_1987__37_4_59_0,
     author = {Ghys, \'Etienne},
     title = {Sur l'invariance topologique de la classe de {Godbillon-Vey}},
     journal = {Annales de l'Institut Fourier},
     pages = {59--76},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {37},
     number = {4},
     year = {1987},
     doi = {10.5802/aif.1111},
     mrnumber = {89e:57023},
     zbl = {0633.58025},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.1111/}
}