@article{IM_1987__87_143425,
     author = {S.J. van Strien},
     title = {Normalhyperbolicity and linearisability.},
     journal = {Inventiones mathematicae},
     pages = {377--384},
     publisher = {mathdoc},
     volume = {87},
     year = {1987},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__87_143425/}
}