1. A.V. Balakrishnan: Applied Functional Analysis. Springer-Verlag, New York, 1976.
2. R.F. Curtain, A.J. Pritchard: Infinite Dimensional Linear System Theory. Springer-Verlag, Berlin, 1978.
3. A. Bensoussan: Filtrage Optimal del Systémes Linéaires. Dunod, Paris, 1971.
4. P. d'Alessandro, A. Germani, M. Piccioni: Relationships between measures induces by Itô and white noise linear equations. Proceedings Xth IMACS Conference, Montreal 1982, to appear on Mathematics and Computer in Simulation.
5. J.L. Kelley: General Topology. Springer-Verlag, New York, 1955.