1. Berson, A., Smith, S.: Data Warehousing, Data Mining and OLAP. McGraw-Hill (1997)
2. Bertino, E., Martino, L.: Object-Oriented Database Systems. Addison Wesley (1993)
3. Bordogna, G., Pasi, G. (eds.): Recent Issues on Fuzzy Databases. Physica-Verlag (2000)
4. Bosc, P., Kacprzyk, J. (eds.): Fuzzyness in Database Management Systems. Physica-Verlag (1995)
5. Cattell, R.G.G.: Object Data Management – Object-Oriented and Extended Relational Database Systems. Addison Wesley (1994)