@article{IM_1989__95_3_143658,
     author = {E. Paul},
     title = {Etude topologique des formes logarithmiques ferm\'ees.},
     journal = {Inventiones mathematicae},
     pages = {395--420},
     year = {1989},
     volume = {95},
     number = {3},
     zbl = {0641.57013},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__95_3_143658/}
}