@article{AFST_1994_6_3_3_335_0,
     author = {Brunella, Marco},
     title = {On the discrete {Godbillon-Vey} invariant and {Dehn} surgery on geodesic flows},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {335--344},
     publisher = {Universit\'e Paul Sabatier},
     address = {Toulouse},
     volume = {Ser. 6, 3},
     number = {3},
     year = {1994},
     mrnumber = {1313353},
     zbl = {0829.58030},
     language = {en},
     url = {http://www.numdam.org/item/AFST_1994_6_3_3_335_0/}
}