1. Albus, J.S., Barbera, A.J., Nagel, R.N., “Theory and Practice of Hierarchical Control”, Proceedings of the 23rd International Conference of the IEEE Computer Society, September, 1981.
2. Barbera, A.J., Fitzgerald, M.L., Albus, J.S., “Concepts for a Real-Time Sensory-Interactive Control System Architecture”, Proceedings of the 14th Southeastern Symposium on System Theory, April, 1982.
3. Brodie, M., Mylopoulos, J., Schmidt, J.W., editors, “On Conceptual Modeling”, Springer-Verlag, New York, 1984.
4. Electronic Industries Association, Standardization Project 1393A: “Manufacturing Messaging Standard Service Specification and Protocol”, draft 7, August 1987, unpublished.
5. ICAM Architecture Part 2, Volume 5: Information Modeling Manual (IDEF1)“, AFWAL TR-81–4023, Air Force Materials Laboratory, Wright Aeronautical Laboratories, USAF Systems Command, Wright-Patterson Air Force Base, OH, June, 1981.