1. Abrial, J.R., “Data semantics,” in Data management systems, J.W. Klimbie and K.L.KofFeman, eds., North Holland, Amsterdam, 1974, pp. 1–59.
2. Albano, A., L.Cardelli, and R.Orsini, “Galileo: A strongly typed, interactive conceptual language”, ACM Trans. on Database Systems, Vol. 10, No. 2, June 1985, pp. 230–260.
3. “ADAPLEX: Rationale and Reference Manual,” Technical Report CCA-83-03, Computer Corporation of America, May 1983.
4. Barron,J. “Dialogue and process design for Interactive Information Systems using Taxis”, Proc. SIGOA Conf. on Office Information Systems, June 1982, Philadelphia, PA, pp.12–20.
5. Brodie, M.L., J.Mylopoulos and J.W.Schmidt, Eds. On Conceptual Modelling: Perspectives from Artificial Intelligence, Databases and Programming Languages, Springer Verlag, New York, 1984.