%0 Journal Article %A A. L. Garkavi %A V. A. Medvedev %A S. Ya. Havinson %T Existence of the best possible uniform approximation of a function of several variables by a sum of functions of fewer variables %J Sbornik. Mathematics %D 1996 %P 623-634 %V 187 %N 5 %U http://geodesic.mathdoc.fr/item/SM_1996_187_5_a0/ %G en %F SM_1996_187_5_a0