Numerical Computation of the Minimal H∞ Norm of the Discrete-Time Output Feedback Control Problem. - Wen-Wei Lin; Chern-Shuh Wang; Quan-Fu Xu (SIAM J. Numer. Anal., 2000)

Invariant Subspace Approach to Linear H∞-Control via Measurement Feedback. - Wen-Wei Lin; Quan-Fu Xu; Fang-Bo Yeh (Ann. Oper. Res., 2001)