%0 Journal Article %A K. Yu. Osipenko %T On the precise values of $n$-widths for classes defined by cyclic variation diminishing operators %J Sbornik. Mathematics %D 1997 %P 1371-1383 %V 188 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1997_188_9_a5/ %G en %F SM_1997_188_9_a5