@article{AIF_2001__51_3_707_0,
     author = {Hickel, Michel},
     title = {Solution d'une conjecture de {C.} {Berenstein} - {A.} {Yger} et invariants de contact \`a l'infini},
     journal = {Annales de l'Institut Fourier},
     pages = {707--744},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {51},
     number = {3},
     year = {2001},
     doi = {10.5802/aif.1834},
     mrnumber = {1838463},
     zbl = {0991.13009},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.1834/}
}