1. Arbib, M. A. and Manes, E. G.: 1974a, ?Machines in a Category: An Expository Introduction?, SIAM Review 16, 163?192.
2. Arbib, M. A. and Manes, E. G.: 1974b, ?Foundations of System Theory: Decomposable Machines?, Automatica 10, 285?302.
3. Arbib, M. A. and Manes, E. G.: 1975, Arrows, Structures, and Functors: The Categorical Imperative, Academic Press, New York.
4. Arbib, M. A. and Manes, E. G.: (to appear), ?Fuzzy Machines in a Category?.
5. Athans, M. and Falb, P. L.: 1966, Optimal Control, McGraw-Hill.