Solvability of nonlinear elliptic systems with degeneration

Degenerate elliptic systems in R-n, n greater than or equal to 4, of the form div(t) A(D(8)u) = f(x) with even s + t are considered. This class of systems, which can be regarded as a limit case of nondegenerate systems of the same form with natural energetic space HB, contains some important degenerate elliptic equations. The existence and uniqueness of weak solutions in special weighted spaces is established.