%0 Journal Article %A V. V. Peller %A S. R. Treil %T Approximation by analytic operator functions. Factorizations and very badly approximable functions %J Algebra i analiz %D 2005 %P 160-183 %V 17 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/AA_2005_17_3_a8/ %G en %F AA_2005_17_3_a8