%0 Journal Article %A V. M. Tikhomirov %T Diameters of sets in function spaces and the theory of best approximations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1960 %P 75-111 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1960_15_3_a1/ %G en %F RM_1960_15_3_a1