TY - JOUR AU - T. Rozhkovskaya TI - Unilateral problems for elliptic systems with gradient constraints JO - Banach Center Publications PY - 1992 SP - 425 EP - 445 VL - 27 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/-27-2-425-445/ DO - 10.4064/-27-2-425-445 LA - en ID - 10_4064__27_2_425_445 ER -