1. M. Yu. Lyubich and Yu. I. Lyubich, ?The spectral theory of the almost periodic representations of semigroups,? Ukr. Mat. Zh.,36, No. 5, 632?636 (1984).
2. M. Yu. Lyubich and Yu. I. Lyubich, ?Splitting-off of the boundary spectrum for almost periodic operators and representations of semigroups,? Teor. Funktsii Funktsional. Anal. i Prilozhen. (Kharkov), No. 45, 69?84 (1986).
3. M. Yu. Lyubich and Yu. I. Lyubich, ?The general form of nonnegative projections in a space of continuous functions on a compactum,? Teor. Funktsii Funktsional. Anal. i. Prilozhen. (Kharkov), No. 43, 87?93 (1985).
4. Yu. I. Lyubich, Introduction to the Theory of Banach Representations of Groups, Birkhauser, Basel (1988).
5. M. Rosenblatt, ?Equicontinuous Markov operators,? Teor. Veroyatn. Primen.,9, No. 2, 205?222 (1964).