Appendix A Bibliography
© National Instruments Corporation A-5 Xmath Model Reduction Module
[SLH81] M. G. Safonov, A. J. Laub, and G. L. Hartmann, “Feedback Properties of Multivariable 
Systems: The Role and Use of the Return Difference Matrix,” IEEETransactions on 
Automatic Control, Vol. AC-26, February 1981.
[SA88] G. Stein and M. Athans. “The LQG/LTR Procedure for Multivariable Control Design,” 
IEEE Transactions on Automatic Control, Vol. AC-32, No. 2, February1987, pp. 
105–114. 
[Za81] G. Zames, “Feedback and optimal sensitivity: model reference transformations, 
multiplicative semi-norms, and approximate inverses,” IEEE Transactions on Automatic 
Control, Vol. AC-26, pp. 301–320, 1981. 
[KS72] H. Kwakernaak and R. Sivan, Linear Optimal Control Systems, Wiley, 1972.