%0 Journal Article %A C. Keem %T On the variety of special linear systems on an algebraic curve. %J Mathematische Annalen %D 1990 %P 309-322 %V 288 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1990__288_1_164737/ %F MAN_1990__288_1_164737