@article{MAN_1986__275_164138,
     author = {Shihoko Ishii},
     title = {Small {Deformations} of {Normal} {Singularities.}},
     journal = {Mathematische Annalen},
     pages = {139--148},
     year = {1986},
     volume = {275},
     zbl = {0586.14001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1986__275_164138/}
}