%0 Journal Article %A Seán Keel %T Basepoint freeness for nef and big line bundles in positive characteristic %J Annals of mathematics %D 1999 %V 149 %N 1 %U http://geodesic.mathdoc.fr/articles/10.2307/121025/ %R 10.2307/121025 %F 10_2307_121025