1. Sufficient conditions for the synthesis of H∞ fixed-order controllers;Ho;Int. J. of Robust and Nonlinear Control,2001
2. Lelic, M. and Z. Gajic (2000). A reference guide to PID controllers in the nineties. IFAC Digital Control: Past, Present and Future of PID Control
3. Miyamoto, S. and G. Vinnicombe (1997). Fixed structure H∞ control design for multiple plants-a coprime factorization and LMI approach. Proc. of 4th ECC, Brussels
4. PID controller optimization for H∞ control by linear programming;Saeki;Int. J. of Robust and Nonlinear Control,2000
5. Parameter space design method of PID controller for H∞ control problem;Saeki;Transactions of the Institute of Systems Control and Information Engineering,1998