%0 Journal Article %A K. V. Chesnokova %T The mapping taking three points of a Banach space to their Steiner point %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2016 %P 40-44 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2016_2_a6/ %G ru %F VMUMM_2016_2_a6