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@article{MAN_1988__280_3_164380, author = {Steven Cutkosky}, title = {Elementary {Contractions} of {Gorenstein} {Threefolds.}}, journal = {Mathematische Annalen}, pages = {521--526}, publisher = {mathdoc}, volume = {280}, number = {3}, year = {1988}, zbl = {0616.14003}, url = {http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164380/} }
Steven Cutkosky. Elementary Contractions of Gorenstein Threefolds.. Mathematische Annalen, Tome 280 (1988) no. 3, pp. 521-526. http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164380/