@article{IM_1989__98_1_143746,
     author = {Y. Eliashberg},
     title = {Classification of overtwisted contact structures on 3-manifolds.},
     journal = {Inventiones mathematicae},
     pages = {623--638},
     publisher = {mathdoc},
     volume = {98},
     number = {1},
     year = {1989},
     zbl = {0684.57012},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__98_1_143746/}
}