@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/