1. Astrahan, M.M., et al.: SYSTEM R: A Relational Approach to Database Management, in: ACM TODS, Vol. 1, No. 2, 1976, pp. 97–137.
2. Batory, D.S., Buchmann, A.P.: Molecular Objects, Abstract Data Types and Data Models; A Framework, in: Proc. 10th VLDB Conf., Singapore, 1984, pp. 172–184.
3. Bancilhon, F., Kim, W., Korth, H.F.: A Model of CAD Transactions, in: Proc. 11th Int. Conf. on VLDB, Stockholm, Aug. 1985, pp. 25–33.
4. Brodie, M.L., Mylopoulos, J. (eds.): On Knowledge Base Management Systems (Integrating Artificial Intelligence and Database Technologies), Topics in Information Systems, Springer-Verlag, New York, 1986.
5. Carey, M.J., DeWitt, D.J., et al.: The Architecture of the EXODUS Extensible DBMS, in: Proc. int. Workshop on Object-Oriented Database Systems, Pacific Grove, 1986, pp. 52–65.