%0 Journal Article %A Charles H. Walter %T Components of the stack of torsion-free sheaves of rank 2 on ruled surfaces. %J Mathematische Annalen %D 1995 %P 699-716 %V 301 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1995__301_4_165315/ %F MAN_1995__301_4_165315