@article{IM_1979__55_186138,
     author = {Henry B. Laufer},
     title = {Ambient {Deformations} for {Exceptional} {Sets} in {Two-Manifolds.}},
     journal = {Inventiones mathematicae},
     pages = {1--36},
     publisher = {mathdoc},
     volume = {55},
     year = {1979},
     zbl = {0509.32010},
     url = {http://geodesic.mathdoc.fr/item/IM_1979__55_186138/}
}