%0 Journal Article %A W. Bühler %A T. Deutler %T Optimal Stratification and Grouping by Dynamic Programming. %J Metrika %D 1975 %P 161-176 %V 22 %I mathdoc %U http://geodesic.mathdoc.fr/item/MET_1975__22_175668/ %F MET_1975__22_175668