%0 Journal Article %A M. K. Potapov %A B. V. Simonov %A S. Yu. Tikhonov %T On the Besov and Besov--Nikol'skii Classes and on Estimates for the Mixed Moduli of Smoothness of Fractional Derivatives %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 2003 %P 244-256 %V 243 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_2003_243_a17/ %G ru %F TM_2003_243_a17