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@article{IM_1991__105_3_143926, author = {Yujiro Kawamata}, title = {On the length of a extremal rational curve.}, journal = {Inventiones mathematicae}, pages = {609--612}, publisher = {mathdoc}, volume = {105}, number = {3}, year = {1991}, zbl = {0751.14007}, url = {http://geodesic.mathdoc.fr/item/IM_1991__105_3_143926/} }
Yujiro Kawamata. On the length of a extremal rational curve.. Inventiones mathematicae, Tome 105 (1991) no. 3, pp. 609-612. http://geodesic.mathdoc.fr/item/IM_1991__105_3_143926/