%0 Journal Article %A Keeler, Dennis %T Criteria for 𝜎-ampleness %J Journal of the American Mathematical Society %D 2000 %P 517-532 %V 13 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-00-00334-9/ %R 10.1090/S0894-0347-00-00334-9 %F 10_1090_S0894_0347_00_00334_9