1. Bećarević, D.: Querying Heterogeneous Data Sources. Technical Report ISG-04-01, pp. 1–25 (2004), www.computing.dcu.ie/~isg
2. Carey, M., Haas, L., Schwarz, P., Arya, M., Cody, W., Fagin, R., Flickner, M., Luniewski, A., Niblack, W., Petkovic, D., Thomas, J., Williams, J., Wimmers, E.: Towards Heterogeneous Multimedia Information Systems: The Garlic Approach. In: Proceedings of the Fifth International Workshop on Research Issues in Data Engineering (RIDE): Distributed Object Management, pp. 124–131. IEEE-CS, Los Alamitos (1995)
3. Catell, R., Barry, D.: The Object Data Standard: ODMG 3. Morgan Kaufmann, San Francisco (1999)
4. Dogac, A., Ozkan, C., Arpinar, B., Okay, T.: METU object-oriented DBMS. In: On Object-Oriented Database Systems, pp. 513–541. Springer, Heidelberg (1994)
5. Elmasri, R., Navathe, S.: Fundamentals of Database Systems. Addison-Wesley, Reading (1994)