@article{MAN_1973__205_162485,
     author = {Henry B. Laufer},
     title = {Taut {Two-Dimensional} {Singularities.}},
     journal = {Mathematische Annalen},
     pages = {131--164},
     publisher = {mathdoc},
     volume = {205},
     year = {1973},
     zbl = {0281.32010},
     url = {http://geodesic.mathdoc.fr/item/MAN_1973__205_162485/}
}