TY - JOUR AU - G. V. Grishina TI - A priori estimates and smoothness of solutions of a system of quasi-linear equations that is elliptic in the Douglis–Nirenberg sense JO - Sbornik. Mathematics PY - 1996 SP - 15 EP - 38 VL - 187 IS - 1 UR - http://geodesic.mathdoc.fr/item/SM_1996_187_1_a1/ LA - en ID - SM_1996_187_1_a1 ER -