%0 Journal Article %A Sun Xia Talo %T Algebraic surfaces whose canonical image has a pencil of rational curves of degree two. %J Mathematische Zeitschrift %D 1992 %P 67-74 %V 209 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1992__209_2_174351/ %F MZ_1992__209_2_174351