%0 Journal Article %A Zhijie Chen %T On the Geography of Surfaces. Simply Connected Minimal Surfaces with Positive Index. %J Mathematische Annalen %D 1987 %P 141-164 %V 277 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1987__277_164241/ %F MAN_1987__277_164241