On solvability of one class of quasielliptic systems

We study the class of systems of differential equations defined by one class of matrix quasielliptic operators and establish solvability conditions for the systems and boundary value problems on ${\Bbb R}^n_+$ in the special scales of weighted Sobolev spaces $W^{l}_{p,\sigma}$. We construct the integral representations of solutions and obtain estimates for the solutions.