%0 Journal Article %A Detlef Laugwitz %T Regular hexagons in normed spaces and a theorem of Walter Benz. %J Aequationes mathematicae %D 1993 %P 163-166 %V 45 %N 2-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AM2_1993__45_2-3_137518/ %F AM2_1993__45_2-3_137518