1. Pohjolainen, S.A. (1982) Robust Multivariable PI-Controller for Infinite Dimensional Systems. IEEE Trans. Automat. Control 27:17–30
2. Pohjolainen, S.A. (1985) Robust Controller for Systems with Exponentially Stable Strongly Continuous Semigroups. J. of Math. Anal. and Appl. 111:622–636.
3. Touré Y., & Josserand L. (1997) An Extension of IMC to Boundary Control of Distributed Parameter Systems. Proc. of the IEEE SMC-CCS, 3, pp. 2426–2431, Orlando, Forida
4. Touré Y., & Rudolph J. (2002) Controller Design for Distributed Parameter Systems. Encyclopedia of LIFE Support on Control Systems, Robotics and Automation, I, 933–979, Eolss Publishers, Oxford
5. Kato T. (1976) Perturbation Theory for Linear Operators. Springer Verlag, Berlin.