Pole-zero cancellations and closed-loop properties of an H∞ mixed sensitivity design problem. - M. C. Tsai; E. J. M. Geddes; Ian Postlethwaite (Autom., 1992)

Improvements in product quality in tandem cold rolling using robust multivariable control. - Eric John Muir Geddes; Ian Postlethwaite (IEEE Trans. Control. Syst. Technol., 1998)