%0 Journal Article %A E. Ballico %A R. Piene %A H.-S. Tai %T A Characterization of Balanced Rational Normal Surface Scrolls in Terms of Their Osculating Spaces II. %J Mathematica Scandinavica %D 1992 %P 204-206 %V 70 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1992__70_1_167198/ %F MS2_1992__70_1_167198