%0 Journal Article %A Mania, M. %A Tevzadze, R. %T A unified characterization of -optimal and minimal entropy martingale measures by semimartingale backward equations. %J Georgian Mathematical Journal %D 2003 %P 289-310 %V 10 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/GMJ_2003__10_2_50819/ %G en %F GMJ_2003__10_2_50819