1. K.J. Åström, Computer Control of a Paper Machine — An Application of Linear Stochastic Control Theory, IBM J. Res. Dev., vol. 11, pp. 389–405, 1967.
2. K.J. Åström, Introduction to Stochastic Control Theory, Academic Press, San Diego, California, 1970.
3. L.G. Bergh, J.F. MacGregor Spatial Control of Sheet and Film Forming Processes, Can. J. Chem. Eng., vol. 65, pp. 148–155, February 1987.
4. S. Bittanti, P. Colaneri, G.D. Nicolao, The Periodic Riccati Equation, in: The Riccati Equation, Springer-Verlag, S. Bittanti, A.J. Laub, J.C. Willems, eds., Ch. 6, pp. 127–163, 1991.
5. T. J. Boyle, Control of Cross-Direction Variations in Web Forming Machines, Can. J. Chem. Eng., vol. 55, pp. 457–461, August 1977.