@article{IM_1987__87_143435,
     author = {T. Urabe},
     title = {Elementary transformations of {Dynkin} graphs and singularities on quartic surfaces.},
     journal = {Inventiones mathematicae},
     pages = {549--572},
     publisher = {mathdoc},
     volume = {87},
     year = {1987},
     zbl = {0612.14035},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__87_143435/}
}