1. [B] R. G. Bartle,The Elements of Real Analysis, 2nd edition, Wiley, New York, 1976.
2. [CL1] E. A. Coddington and N. Levinson,Theory of Ordinary Differential Equations, McGraw-Hill: New York, 1955.
3. [CG] M. Corless and L. Glielmo, On the exponential stability of singularly perturbed systems,SIAM J. Control. Optim.,30(6) (1992).
4. [CL2] M. Corless and G. Leitmann, Controller design for uncertain systems via Lyapunov functions,Proc. Amer. Control. Conf., Boston, MA, 1988.
5. [D1] R. DeCarlo,Linear Systems: A State Variable Approach with Numerical Implementation, Prentice-Hall: Englewood Cliffs, NJ, 1989.