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This paper presents a procedure for constructing a stable decentralized output feedback controller for a class of uncertain systems in which the uncertainty is described by Integral Quadratic Constraints. The controller is constructed to solve a problem of robust $H^{\infty }$ control. The proposed procedure involves solving a set of algebraic Riccati equations of the $H^{\infty }$ control type which are dependent on a number of scaling parameters. By treating the off-diagonal elements of the controller transfer function...