\begin{thebibliography}{10}

\bibitem{alligood97}
K.~T. Alligood, T.~D. Sauer, and J.~A. Yorke.
\newblock {\em {CHAOS} An Introduction to Dynamical Systems}.
\newblock Springer-Verlag, New York, 1997.

\bibitem{ctchen99}
C.-T. Chen.
\newblock {\em Linear System Theory and Design}.
\newblock Oxford University Press, New York, third edition, 1999.

\bibitem{friedland96}
B.~Friedland.
\newblock {\em Advanced Control System Design}.
\newblock Prentice-Hall, Englewood Cliffs, New Jersey 07632, 1996.

\bibitem{kailath80}
T.~Kailath.
\newblock {\em Linear Systems}.
\newblock Prentice Hall, {Englewood Cliffs, New Jersey 07632}, 1980.

\bibitem{kalman63}
R.~E. Kalman.
\newblock Mathematical description of linear dynamical systems.
\newblock {\em J. SIAM Control, Ser. A}, 1(2):152--192, 1963.

\bibitem{kelly94}
K.~Kelly.
\newblock {\em Out of Control{:} {T}he New Biology of Machines, Social Systems
  and the Economic World}.
\newblock Addison-Wesley Publishing Company, Reading, Massachusetts, 1994.

\bibitem{macfarlane79}
A.~G.~J. Mac{F}arlane.
\newblock The development of frequency-response methods in automatic control.
\newblock {\em IEEE Transactions on Automatic Control}, AC-24(2):250--265,
  April 1979.

\bibitem{mayr70}
O.~Mayr.
\newblock {\em The Origins of Feedback Control}.
\newblock The {M.I.T.} Press, Cambridge, Massachusetts, 1970.

\bibitem{owens81}
D.~H. Owens.
\newblock {\em Multivariable and Optimal Systems}.
\newblock Academic Press, London, 1981.

\bibitem{sontag98}
E.~D. Sontag.
\newblock {\em Mathematical Control Theory: {D}eterministic Finite Dimensional
  Systems}.
\newblock Springer-Verlag, New York, second edition, 1998.

\end{thebibliography}
