%0 Journal Article %A John Douglas Moore %T On the number of minimal two-spheres of small area in manifolds with curvature bounded above. %J Mathematische Annalen %D 1990 %P 323-344 %V 288 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164738/ %F MAN_1990__288_1_164738