@article{GDZPPN002108933, title = {On the length of a extremal rational curve.}, journal = {Inventiones mathematicae}, volume = {104}, year = {1991}, pages = {609-612}, zbl = {0751.14007}, url = {http://dml.mathdoc.fr/item/GDZPPN002108933} }
Kawamata, Yujiro. On the length of a extremal rational curve.. Inventiones mathematicae, Tome 104 (1991) pp. 609-612. http://gdmltest.u-ga.fr/item/GDZPPN002108933/