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Dedicated to Professor Heisuke Hironaka on his sixtieth birthday
Oblatum 20-XI-1990
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Kawamata, Y. On the length of an extremal rational curve. Invent Math 105, 609–611 (1991). https://doi.org/10.1007/BF01232281
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DOI: https://doi.org/10.1007/BF01232281