1. Allen, J.F. Maintaining Knowledge about Temporal Intervals. Communications of the ACM. 26: 832–843, 1983.
2. Blackburn J. lime-based Competition. Business One Irwin, 1991.
3. Davenport, T.H. Process Innovation: Reengineering Work through Information Technology. Harvard Business School Press, 1993.
4. Fadel, F., Fox, M.S., Grtininger, M. A generic enterprise resource ontology.Third Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises, Morgantown, West Virginia, 1994.
5. Fox, M.S., Chionglo, J., Fadel, E A Common-Sense Model of the Enterprise, Proceedings of the Industrial Engineering Research Conference 1993.