%0 Journal Article %A Wolfgang Wasow %T The Central Connection Problem at Turning Points of Linear Differential Equations %J Commentarii mathematici Helvetici %D 1971 %P 65-86 %V 46 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMH_1971__46_139462/ %F CMH_1971__46_139462