1. V. I., Oseledec, A multiplicative ergodic theorem, Lyapunov characteristic numbers for dynamical systems, Trudy Mosk. Mat. Obsce., 19 (1969), 179?210.
2. R. J., Sacker and G. R., Sell, A spectral theory for linear differential systems, J. Differential Equations, 27 (1978), 320?358.
3. R. A., Johnson, K. J., Palmer and G. R., Sell, Ergoic properties of linear dynamical systems, SIAM J. Math. Anal., 18 (1987), 1?33.
4. S. T., Liao, On characteristic exponents construction of a new Borel set for the multiplicative ergodic theorem for vector fields, Acta Scientiarum Naturalium Universitatis Pekinensis, 29 (1993), 277?302.
5. J. Palis and W. Melo, Geometric Theory of Dynamical Systems, Springer-Verlag, (1982).