1. ; : Stability of Solutions of Differential Equations in Banach Spaces. Moscow: Nauka 1970 (in Russian).
2. ; : Qualitative Theory of Stochastic Systems. Universität Bremen, FS Dynamische Systeme: Report 36, 1981.
3. : Ergodentheorie linearer stochastischer Systeme. Universität Bremen, FS Dynamische Systeme: Report 59, 1981.
4. ; : Methods of Modern Mathematical Physics. II. Fourier Analysis, Self-adjointness. New York: Acad. Press 1975.