1. Atkinson M. et al. The object-oriented database system manifesto. Proc. Int. Conf. Deductive and Object-Oriented Databases, Elsevier, Amsterdam, 1989, pp. 40–57.
2. Beeby W.D. The heart of integration: A sound database. IEEE Spectrum, 20(5):44–48; 1983.
3. Bertino E., Martino L. Object-oriented database management systems: Concepts and issues. IEEE Computer, 24(4):33–47; 1991.
4. Date C.J. An Introduction to Database Systems, 4th Edition, Addison-Wesley, Reading, MA, 1986.
5. Codd E.F. A relational model for large shared data bases. Communications of the ACM; 13(6):377–387; 1970.