%0 Journal Article %A V. I. Danilov %A G. A. Koshevoy %T Nilpotent operators and discretely concave functions %J Izvestiya. Mathematics %D 2003 %P 1-15 %V 67 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_2003_67_1_a0/ %G en %F IM2_2003_67_1_a0