@article{BSMF_1996__124_1_35_0,
     author = {Lion, Jean-Marie and Roche, Claude Andr\'e},
     title = {Topologie des hypersurfaces pfaffiennes},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {35--59},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {124},
     number = {1},
     year = {1996},
     doi = {10.24033/bsmf.2275},
     mrnumber = {97k:32012},
     zbl = {0852.32007},
     language = {fr},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2275/}
}