%0 Journal Article %A J. Lawrence %T Valuations and Polarity. %J Discrete & computational geometry %D 1988 %P 307-324 %V 3 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131053/ %F DCG_1988__3_1-2_131053