%0 Journal Article %A D. V. Georgievskii %A M. V. Shamolin %T Valerii Vladimirovich Trofimov %J Contemporary Mathematics. Fundamental Directions %D 2007 %P 5-15 %V 23 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMFD_2007_23_a0/ %G ru %F CMFD_2007_23_a0