%0 Journal Article %A D. V. Georgievskii %T Perturbations of sliding surfaces in the three-dimensional theory of perfect plasticity %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 2001 %P 45-50 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_2001_3_a8/ %G ru %F VMUMM_2001_3_a8