1. G. Birkhoff, Dynamical Systems (Amer. Math. Soc., Providence, 1927)
2. R. Bellman, K.L. Cooke, Differential-Difference Equations (Academic, New York, 1963)
3. S. Smale, Differentiable dynamical systems. Bull. Am. Math. Soc. 73, 747–817 (1967)
4. H.K. Khalil, Nonlinear Systems (Macmillan, New York, 1992)
5. G.R. Sell, Lectures on Topological Dynamics and Differential Equations (Van Nostrand, Princeton, NJ, 1969)