%0 Journal Article %A G. A. Seregin %T On differential properties of weak solutions of nonlinear elliptic systems arising in plasticity theory %J Sbornik. Mathematics %D 1987 %P 289-309 %V 58 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1987_58_2_a0/ %G en %F SM_1987_58_2_a0