@article{IM_1981__64_142814,
     author = {Ngo Van Que and Robert Roussarie},
     title = {Sur l'isotopie des formes ferm\'ees en dimension 3.},
     journal = {Inventiones mathematicae},
     pages = {69--88},
     year = {1981},
     volume = {64},
     zbl = {0467.58004},
     url = {http://geodesic.mathdoc.fr/item/IM_1981__64_142814/}
}